Colton Underwood believes women should be throwing away all of their underwear that is stained during menstruation, insisting it is 'gross' for them to be wearing period panties.

The 27-year-old Bachelor star revealed just how clueless he is about menstruation when he sat down with Keltie Knight, Becca Tobin, and Jac Vanek, the hosts of The LadyGang, E!'s new show based on the podcast of the same name.

During a round of 'Ask Me Anything,' Keltie asked him he is able to notice if a woman is wearing 'a cute underwear or a period underwear' — and he was noticeably shocked to learn that the latter exists.

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Unpopular opinion: Colton Underwood, 27, shared his thoughts on 'period underwear' when he sat down with the hosts of The LadyGang, E!'s show based on the podcast of the same name

Say what? The Bachelor star was shocked to learn that women keep their period-stained panties and wear them when they are menstruating. 'You keep 'em around?!' he asked

'There's a difference?' he asked, prompting Becca to explain that women have 'special underwear' designated for that time of the month.

'You keep 'em around?!' he said with disgust. 'Go buy new underwear.'

The former football player couldn't get over the fact that women keep their period-stained underwear — even after Becca reminded him that menstruation 'happens every month.'

'Throw them away,' he insisted. 'I, as a husband and a boyfriend, will go buy you new underwear. That is so gross.'

Start of it all: Host Keltie Knight was the one who asked asked him if he is able to notice if a woman is wearing 'a cute underwear or a period underwear'

Great debate: Colton couldn't get over the fact that women keep their period-stained underwear, and he compared period leaks to soiling yourself

Views: 'Throw them away,' he insisted. 'I, as a husband and a boyfriend, will go buy you new underwear. That is so gross'

Colton went on to compare period leaks to soiling yourself, which turned out to be a moot point because most of the ladies said they would just wash their underwear in that instance as well.

'So, if you s**t your pants, are you just going to wash them?' he asked. 'No, you’re throwing them away.'

Although he only voiced his opinion on underwear with period stains, it's not difficult to imagine what he would think of actual period-proof panties that are to be worn in place of tampons or pads.

If he's a man of his word, it sounds like he will be gifting his girlfriend Cassie Randolph a lot of new underwear in the foreseeable future.

Nope: There were plenty of women were less than impressed with Colton's ignorant attitude towards period leaks

Get with it: Critics couldn't help but point out that he is a virgin who knows nothing about women's bodies

Over him: A woman name Rachel said the former football player 'is officially the worst'

Not sorry: A Twitter user named Elizabeth said she would never give up her actual period-proof underwear, which are meant to be worn instead of tampons or pads

Not holding back: One critic called him a 'small-minded d**k'

You played football right? Some couldn't figure out why he was so freaked out over a little blood

Unsurprisingly, there were plenty of women were less than impressed with Colton's ignorant attitude towards period leaks.

Critics couldn't help but point out that he is a virgin who knows nothing about women's bodies.

'@colton has proven to be a small-minded d**k who knows nothing about women. You're inexperience and lack of education about women and women's bodies is showing, dude,' one woman tweeted.

'@colton compared having your period leak in your underwear to shitting your pants...this is why I’m forever grateful my boyfriend grew up with for sisters so he’s not an ignoramus,' another wrote.

Another thought: As part of the interview, Colton also weighed in on whether women should get waxed regularly, saying: 'Yes, 100 per cent'

Secret: Colton remained mum about whether or not he was still a virgin after revealing he is still in a relationship with his girlfriend Cassie Randolph following The Bachelor finale

Some couldn't figure out why he was so freaked out over a little blood.

'@colton did you throw out every jersey you ever bled on in football?' one woman asked.

As part of the interview, Colton also weighed in on whether women should get waxed regularly.

'Yes, 100 per cent,' he said, much to Becca's dismay.

The reality star later shared his thoughts on how many times a week a woman should have sex with her husband.

'Ideally, probably, like, three to four,' he said.

However, he remained mum about whether or not he was still a virgin.