The list starts with bad sex – when you’re in your 20s you still aren’t necessarily sure exactly what you like, how you like it and who you like it from. In the midst of your sexual experimentation, there are bound to be a few less-than-awesome experiences. Your partner might have absolutely no idea what he or she is doing, or just be too self-involved to care.

“You’re convenient” sex – maybe it’s the person who you’ve run into in your apartment building on occasion and shot a seductive glance, or that friend of a friend who lives three blocks away and made out with you at that party a few months back. You’ll probably phone him or her after midnight and only when you’re bored and you’ll hopefully enjoy yourself thoroughly once that call is made, the Huffington Post reported.