Distinguish between serious and casual sex
“Ask yourself: is the sex really, truly casual? It can get tricky when you know someone a little but haven’t figured out your feelings yet. So the fewer details you have about him, the more your brain will let things be purely physical. A lot of times after casual sex, a woman will take whatever she knows about the guy and build him up as the perfect partner and daydream about a life with him, which can increase attachment.
Check yourself by remembering that you don’t know him well – after all, he could be weird and think it’s normal to take you on a date to a fast food chain. And you don’t want feelings for someone like that.” – Jordana Abraham, co-author of I Had a Nice Time and Other Lies (Simon & Schuster; R221)