Couples who hope to boost their chances of conceiving by abstaining from sex for days or even weeks, pay attention: You might not be helping. Australian researchers have found that, at least for 42 fertility-challenged males in their study, frequent sex appears to improve sperm quality.

How come? Because between episodes, stored sperm is damaged by free radicals. (Damn you, free radicals! First my mitochondria, then my brain, and now this!) If the system doesn't get cleaned out every now and then, then woozy, flaccid-tailed swimmers end up getting in the way of their healthier counterparts.

The—sorry, I can't resist this one—nut quote from a fertility doctor in the Times Online: "If you are a guy who has high DNA damage and a decent sperm count, it is probably in your interest to ejaculate every day."