What keeps passion alive in a long-term relationship? According to a recent study of nearly 40,000 adults (all of whom were heterosexual and currently in romantic relationships), there were five key differences between people who said they were able to keep the passion going and those who weren’t. People who kept the spark alive were more likely to (1) spend time setting the mood, (2) practice sexual communication, (3) receive oral sex, (4) be happier with their relationship in general, and (5) engage in more acts of sexual variety.

While there’s a lot to be said about each of these factors, I want to focus on just one of them in this post—the role of sexual variety. As I’ve written before, we have a tendency to grow tired of sexual routines, while sexual novelties can reawaken our interest in sex. So what are some good ways that couples can add novelty and variety to their sex lives? A great place to start is to look at what the most sexually satisfied couples are doing.

In the table below, you can see 17 different acts of variety and how they differed between sexually satisfied and dissatisfied men and women in the study mentioned at the beginning of this post. What you’ll see is that, across the board, sexually satisfied folks were adding variety to their sex lives in all kinds of ways.