Hence, right after sex, many men experience their own form of post-orgasmic regret, a sense of entrapment and desire to flee. Some anthropologists argue that this in an evolutionary response—women have a limited amount of eggs and men have an unlimited amount of sperm. So women are going to be choosier about whom they sleep with while men are going to be more indiscriminate, and then consequently want to get out when they’re with a woman with whom they’re not interested in mating with. So let’s cut to the chase. He may be saying all the right things, but his actions and sexual signals post-sex may be saying otherwise. Cherish the cuddler, retrain the rollover-er and when it comes to the up-and-outer, beat him to the door and don’t look back!

Ian Kerner, Ph.D., FAACS, is the author of She Comes First: The Thinking Man's Guide to Pleasuring a Woman, selected by Amazon.com and Borders as a “Best of 2004” non-fiction title. A companion book, He Comes Next: The Thinking Woman's Guide to Pleasuring a Man was published in January 2006. Ian also authored The New York Times best seller Be Honest-- You're Not That Into Him Either. Ian lives in New York City with his wife, son, and Jack Russell Terrier.