There you are — in bed with your partner, panting, sweaty and ready for round two. Your brain is cocked and ready to rock, but your body just... Can't. Literally. If you've ever wondered why you don't ...

If you type into a search engine - "why do men have to wait before having sex again?" - you will very quickly come across Prolactin. This little hormone is thought to be involved in hundreds of ...

There are many great mysteries of science: How did life begin? Is the universe infinite? Why does the male of our species need a rest period after ejaculation before round two? This third question may ...