57) Anal sex should be approached by heterosexual couples with great caution. It is, literally and figuratively, a pain in the ass. When done right, it can provide a modicum of enjoyment for at least one of the people involved. When not done right, which is more often than not, it can result in anything from discomfort to the stuff of nightmares. And always use lube. Life is not like porn. Spitting won't do the trick.