there might be much more in common between sex, parasites and immunity than one thinks, if a recent study is anything to go by.

Evolutionary biologists who have for decades pondered on why sexual reproduction is so prevalent did not have much evidence to help them. Now Andrew Read, Mark Viney and Alan Gemmill of the University of Edinburg, uk, may have some answers after their study on parasite behaviour, reported in a recent issue of the journal Evolution . The team has come up with observations that support one of the most elegant theories of sex