In the Guardian today there was an edited extract from "The Year Of Living Biblically", the account of one man's attempt to follow the Bible literally. It included his account of attempting to stone an adulterer, and his wife's reaction to his refusal to touch her, or any surface she sat or lay on in the week after she started menstruating.
The whole article is here. Here's another quote:
The Bible's female impurity laws are more famous, but there are, in fact, corresponding laws of male impurity. Leviticus says a man shall be unclean for the day after his "emission of seed", as the Bible phrases it, and must take a bath to purify himself. My male friends usually assume I'm evading the handshake because of germs. Since I'm required to tell the truth, I say, "No, not germs." Then I explain. Which somehow turns out to be even more awkward than discussing their cycles with women. Men just don't like talking about their emissions.
"Well, I haven't in a week," John said. "Not that it's any of your business."
I've learned that men of my vintage aren't having a whole lot of sex.