15 Scientific Factors That Secretly Influence Who You Have Sex With

15 What Side They Approach From

Imagine a faceless, shapeless blob (that is, someone whose attractiveness you can’t otherwise judge) leaned over and whispered into your ear something sexy like, “Let’s go out behind the bushes and get weird.” If they said it into your right ear, you’re 50 percent more likely to be like, “Sure thing, featureless monster.”

14 Whether You’re Ovulating

Ovulation (that is, the phase of a woman’s menstrual cycle when she’s fertile) lowers women’s standards, so maybe stay home for a few days if you’re not looking to make some mistakes. Better turn your phone off, too.

13 Birth Control

Women who go off hormonal birth control to procreatively bone might be in for a nasty shock. It tricks their bodies into thinking they’re already pregnant, making them attracted to more nurturing guys, so once they quit to have Mr. Sensitive’s baby, they might find they’re suddenly into the opposite, i.e. broad and grunty.

12 How Much They Smile

This one depends largely on who you are and who you’re trying to get with: Men prefer women who smile more, while women like men who smile less (or even look vaguely ashamed). Extrapolate and/or quit society as needed.

11 Whether They Touch Your Arm

Lightly touching a woman on the arm makes her more likely to agree to dance or give out her phone number because touchers are considered more attractive and (sigh) more dominant. Again, we’re not saying it’s not problematic, but it’s kind of humanity’s problem.

10 The Tilt of Their Head

Those MySpace girls were on to something. When women tilt their chins down, they’re considered more attractive. Again, the opposite is true for men, so show off them nose hairs, boys.

9 The Color They’re Wearing

Finally, some egality: All genders rate the same person as more attractive if they’re wearing red versus some other, more boring color. Aren’t you glad you kept all those polos from your Target days, you hoarder?

8 Facial Hair (If No One Else Has It)

Remember those embarrassing few years back when every (capable) man between the ages of 16 and 35 looked like they were on the bench for ZZ Top? There was a reason for it, at least at first. Women do like beards, but only when most men don’t have them. Once a critical fuzz threshold has been reached, they revert to a preference for the Gillette look.

7 Genetics

You have a secret superpower, and it’s sensing immune profiles. (We never said it was cool.) Women prefer the smells of men whose genetic immune profiles are the most different from their own, which is helpful for your future offspring but also to everyone hoping to avoid a distant cousin.

6 If You’re Scared

If you ever find yourself weathering some heavy turbulence, don’t be surprised if your fellow passengers start looking like airline snacks. Your body tends to mistake the racing heartbeat of fear with one of lust, tricking you into thinking you’re turned on by whoever you’re with, which is why scary movies are a time-honored drive-in tradition.

5 If You’re Anxious

The same thing tends to happen to anxious people too, so feel free to kickstart your next Tinder date by texting them to ask about their memories of gym class or their master’s thesis a few hours before.

4 What Your Parents Look Like

The Freudians weren’t right about much, but we do gravitate toward people who look like our preferred-gender parent. This would seem to counteract the whole “genetic diversity” thing, but it’s mostly body type, with a preference for only a slight resemblance in faces, which still means if you saw your parents from behind in a strange place, you might consider hollering.

3 Your Parents’ Ages

Similarly, people raised by older parents tend to have older partners, though to be fair, those people might just be willing to go to unusual extremes to get their parents some friends.

2 Literally Just Being Nearby

There’s a concept called the propinquity effect that ties attraction to sheer physical proximity. Basically, the more often you bump into someone, the more likely you are to start thinking they’re kinda cute. This is not a blank check to start stalking someone’s social media and “just happen to show up” everywhere they go.

1 Who You’ve Had Sex With Before

Think you don’t have a type? Wrong. You might not have started out with one, but one of the biggest factors of our perception of beauty is familiarity. We prefer faces similar to those of our friends, loved ones, and yes, exes, because we associate those people with good times. It’s not all freaky biological pranks -- sometimes we just want someone who reminds us of our favorite weirdos.

Top image: Toa Heftiba/Unsplash