Not using a condom
Come. On. Unless you’re in a committed relationship where both of you have been tested and/or you’re trying to spawn, then please do the rest of us a favor and bag that shit. Doesn’t matter if she’s on the pill. Perhaps you’ve heard of a little something called herpes? What about HPV? The CDC says one in six people in the US ages 14 to 49 have genital herpes. Twenty million Americans have HPV, and at least half of all sexually active people will get it at some point in their lives. So congrats that you aren’t getting pregnant, but no one will buy you gifts for getting herpes.
Also, and I’m sure you know this, she CAN get pregnant if she’s on top, too. And also in a hot tub. (Less fun note: Diseases like herpes and HPV are spread through skin contact, so while wearing condoms greatly reduces the risk of infection, there are still ways to get these diseases in places that condoms don’t cover. Wear a condom, but also get tested on a regular basis.)