Oct 16, 2011 8:30 PM GMT
Lotharios who are lucky in lust may not - in one sense at least - be the biggest shots in the bedroom, a new theory suggests.
Less attractive men with fewer notches on their belts are likely to be more productive between the sheets, it is claimed.
Males with the opportunity to have sex a lot would be likely to produce less sperm on each occasion than those making fewer sexual conquests.
Researchers modeled the concept of "spreading sperm" mathematically in a paper to be published in the journal American Naturalist.