Yeah, me neither.
I was reading Cosmopolitan yesterday and they described it thus:
'Ever heard of ‘sex dust’? It’s the reason that when you’re getting it, suddenly a whole load more men seem interested. Magic? No, just physiology. When you have sex, hormones and other chemicals are released and while you may not be able to see the difference, others can sense it.'
I tried to search it on Google and all I found were references to the Lion King and that urban legend about some bored Disney film-makers who lazily wrote sex in the sky above Simba for shits and giggles.