Gwyneth Paltrow shares her top tips for anal sex in Goop's Second Annual Sex Guide, including her do's and don'ts for butt sex. Maybe you think anal is NBD. It's just another frontier you need to cross with your partner on the long road to "becoming one." There's nothing better, your friends will say. Why Girls Should Never Have Anal Sex once you 've been on your first, or second, or third long-term relationship and have sweated. Get the goods on joining the "Backdoor Betty" club. These worries plague plenty of first -timers, so don't be concerned if you feel a little overwhelmed at the thought of it. you might have about how to have anal sex, straight from a doctor. 1. I found it interesting to learn that you can lose things in the butt.