What your body does is unrelated to your heart. Don't believe it. The same survey reports that hooking up commonly takes place when both participants are drinking or drunk, and it's not hard to guess the reason why: After a certain amount of this, you may need to get drunk to go through with it.
It reached a point where the paranoia was getting to me. Everywhere I looked, it seemed like people were hanging out, wanting to date, hooking up, wanting to hook up—it was relationships, relationships, relationships everywhere. Guys checking out girls, girls checking out guys. Dudes checking out dudes, chicks checking out chicks. Fuck! That’s what being a teenager was all about.