Labels are important. They help us. They can protect us. Labels tell you that there are baked beans in the tin you’re holding; labels warn us not to wash our merino sweater above 30 degrees. We trust labels, because without them, we’d get it wrong. But sometimes, labels don’t work – they are derogatory or incorrect or unwelcome. One part of society where labels are changing is within sexuality and gender. As the landscape expands from straight/gay and man/woman to include bisexuality, queerness and trans people, among others, many are finding themselves moving away from the specific, restrictive pigeonholing a label can bring and merely tagging themselves “Me”.

But what happens when you’re happy with the label society has assigned you, but quite fancy trying out something someone like you doesn’t normally do, or what if you start to travel down one path, only to find you prefer another, and want to change course and stay on it for ever? Do you have to re-label yourself? Does it mean you’re not who you thought you were? Is it time to mute whichever episode of Stranger Things you’re watching, stand up, tell the room you dreamt another man’s erection touched you and have an identity crisis? In short: if you’re straight but have sex with another guy, does it make you gay?

It rather depends on what you think being gay means. For most people, ask what "gay" means to them and, if we’re talking about guys, they’ll say a man who has sex with other men. And this, of course, is a huge part of being gay. But the reduction of gayness to be nothing more than just sex can not only be counter-productive – as in, uptight straight guys are missing out on something quite spectacular – and, frankly, homophobic, but it’s also plain wrong.

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You know when you see a kid acting or talking a certain way and you think, “they’re gay” or “they’ll be gay when they’re older” – how do you explain that? They don’t even know what sex is yet, straight or gay. The feelings "gay" children have and the character traits they display can’t be boiled down to some potential gay sex they may or may not be having 10 or 15 years down the line – that’s gayness right there, already in play. Whether you believe in nature or nurture or any other theory, there’s more to being gay than just shagging another guy.

So if we remove the label of "gay" from sex acts we traditionally assume are only the domain of gay men, does this mean you can take part in them and still be straight? Where do we draw the line? Getting a blow job from a guy, for example, is something a lot more straight men have experienced than the stony faces down at the Dog and Gun might have you believe. Is it less gay if there’s no mutual contact of genitals? Because it’s passive? A service, almost?

James, 28, says he regularly got blowjobs from a gay pal in his teens, but he doesn’t consider himself gay. “Me and my mate would fool around but mainly he would do it to me,” he explains. “I wasn’t as interested in his cock as he was in mine, but I think we both got something out of it.” If there’s one thing hormone-frazzled 17-year-old boys aren’t getting anywhere near enough of as they want, it’s oral sex. “I didn’t have a girlfriend yet and my mate was just discovering his sexuality and wanted to try. I always made it clear we weren’t in a relationship and that nobody should know. But I didn’t feel guilty and I think he was cool with it.”

You could argue that there was an element of exploitation to James’s relationship with his mate. The friend was finding his feet with his sexuality and James was the willing guinea pig – as long as nobody found out – but if you’re encouraging a gay man to perform fellatio on you, aren’t you gay? “I’ve never been with a man since and I’m happily married now. I doubt I’d do it again as that would mean being unfaithful, but I consider myself straight. It’s fine to experiment; it’s a big part of finding out who you are.”

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And what about when contact with another man happens as part of your relationship? Mark, a 28-year-old investment banker had already had one skirmish with a gay guy when his colleague’s boyfriend came on to him in a club bathroom and went down on him – real life really is stranger than soap opera – but his second time was a different matter altogether. His girlfriend was there.

“I was in the couples room at Torture Garden [a fetish club in London] and a stranger gave me a blowjob,” Mark explains. “I was there with my girlfriend at the time and we’d both got pretty wild.”

So why stop at a blowjob and not take it further? When in Rome, and all that. “I just didn’t really feel the desire to f*** him. I suppose it’s possible I might go further one day but I think it’s very unlikely. I almost never think men are attractive.”

But if you’re involving a third person in your hitherto straight sex life, does this mean either you or your partner is bisexual? For Mark, it’s not a concern. “Why do I continue to identify as straight? I suppose it’s because I couldn’t imagine myself having a relationship with a man. In the same way I have gay friends who’ve f***ed women, but would never identify as bi, or worry they’re straight.

“I think that ‘being gay’ or ‘being straight’ is about much more than some sexual contact.”

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So a BJ is a BJ, but what about when things go further? Is the threshold for gayness actual penetration? Surely, if you’re having anal sex with a man, you’re gay, no? That’s what the guys in the locker room would say, right?

Thinking about having sex with a man isn’t a sign you’re gay yourself, no more than idly imaging pushing your evil boss under a truck means you’re a latent homicidal maniac. Sometimes, though, even if you’ve never imagined it, when the opportunity presents itself, a primal instinct takes over, as videographer Zak, 25, discovered.

“I'd never really thought about being bi or gay, he explains. “I'd only ever been with girls and had never really been sexually attracted to any guys.

“When I was 20 a load of our sixth form year got together for a party. George was a guy from my year I’d known fairly well but never been close to. We were both fairly drunk and I remember just feeling happy to see him for the first time in ages and for some reason, knowing he was gay, I kissed him rather than hugging him. We chatted for a bit and then we both carried on with the night – not really thinking much about it.”

So far, so straight – no need to adjust any labels so far. Everyone is as they should be.

Zak continues: “Later on, we were both alone on the landing and he kissed me again. This time, for some reason, I didn't really stop him and before long we were fully making out – we snuck into one of the bedrooms and one thing led to another.”

But was this a harrowing experience? Was there much soul-searching or did Zak just have a blast?

“I did enjoy myself. I suppose I'm quite a sexually liberal person and didn't really think of it as being 'gay', it was just was fun and at the time I was enjoying it.”

The ability to distance oneself from any gayness of a sex act perhaps comes from how it plays out. Who shags who, who touches what – that kind of thing. Like James getting a BJ from his pal, Zak’s mate was also providing a service of sorts, but Zak was an active participant. “We had sex, both oral and anal,” says Zak. “I ‘topped' [the other guy played a passive role and ‘received’], I don't think I’d have been comfortable with it the other way around.”

It’s not uncommon for straight men who have sex with another man to experience "gay panic" and feel guilty about what they’ve done and what it means. This can, on occasion, lead to persecution of, or violence against the other guy, whether he’s gay or also straight. But Zak remains unfazed about the experience.

“I wasn't embarrassed or ashamed,” he says. “I still identify as straight and don't think I’d initiate something with a bloke, but put in the same situation I could see myself doing it again.”

Some guys might worry that they were gay – and if you’re wondering why anyone would "worry" about such a thing, do take a moment to research how gay men and women are treated across the world – but Zak takes a more relaxed approach.

“One of my uni friends described himself as 'hetero-flexible' and I reckon that's probably where I am at too,” says Zak. “I don't think repeating it would make me ‘gay'. I'm not attracted to them but I can appreciate men who are attractive. In the same way I’ve slept with women in the past who I don't think I was really attracted to, sometimes sex is just sex and it's fun.”

And Zak’s right, sex is just sex. It’s common for gay people, when they first come out, to say their sexuality doesn’t define them, that there’s more to them than simply being gay. It’s all part of the process of recognising your sexual orientation and assert yourself as an individual, not part of some flock or movement. It’s the vestigial feelings of shame that coming out is supposed to eradicate, hanging on for dear life. “I’m not like the others,” they think. Most of us get over it eventually and reconcile with the fact we’re gay, but this refusal to define can, in some cases, be a positive thing – a defiance of society’s boring old norms. As long as it’s used constructively and positively, and not homophobically of course.

You as an individual get to decide how you label your sexuality, if at all. As long as nobody’s feelings are getting screwed over, you’re free to have sex with men or women at will and still call yourself straight.

But it’s worth acknowledging that you’re merely a tourist and all the privilege this gives you. You get all the pluses of gay sex – and they are pluses, admit it, you love it – but, as long it’s kept on the downlow, none of the prejudice and pressures the LGBT community faces apply to you. You get to dip in, and out, with little or none of the comeback.

Labels inform and warn and categorise, but they also help us come to terms with who we are. A label can be something to cling to, to identify with, to make us feel safe, to tell the world what we’re about.

Having sex with a man doesn’t mean you’re gay, but don’t forget the sacrifices your gay brothers make so you can have that freedom to choose.

Avoiding them altogether is brave, choosing one and then flouting the conventions of it could be braver still, but living with a label 24/7 and taking all the consequences it throws at you is perhaps the bravest path of all. And those repercussions can be noxious: LGBT people are discriminated against, mocked, beaten and murdered, all for doing things you get to do without question. Just for being.

Having sex with a man doesn’t mean you’re gay, definitely not. You get to be who you want to be. But don’t forget the sacrifices your gay brothers make on a daily basis so you can have that freedom to choose. You get to go back to your privileged status in the world – we can only be us.

"Gay" sex acts aren’t something to be ashamed of; if you’re man enough to do it and still call yourself straight, be man enough to talk about it. Don’t let it be a dirty little secret; own your sexuality – whatever it may be – with pride.