Youth is supposed to be a time of lust and raging hormones, so why is it that some couples' sex lives perish rather than flourish? The reasons why we want to have sex are often simple, the reasons why we don't can be a lot more complicated.

This week, Nina unravels the conundrum of a sexless duo who should be at it like a pair of those proverbial battery bunnies, but just can't seem to get on the same sexual wavelength.

Got something you want to ask Nina? (Of course you do.) Drop her a line at tuesdayswithnina@gmail.com. Now, while can’t promise that every question received will get a personal response, however, those that do will be answered frankly, entertainingly, enlighteningly and, if we know Nina, in the spirit of happy, healthy sex and a satisfied libido.