Should a man always be willing to have sex?

I'm female, but I'm very aware that men are not into sex 24/7, we all of both sexes have times when we're too tired, not in the mood etc, so most women should be aware that men cannot turn on the 'urges' any more than us women can. As to how to turn a woman who is after your body down, I would say use your body language, as I would think the folded arms, look of disinterest and glancing at someone else would be enough to get the message across you don't want her in the same way! If she is tipsy and therefore may not be willing or able to read those subtle hints, then just say sorry I'm spoken for, or pretend you need the loo, walk away, and when you get back, sit or stand elsewhere, it's the strategy I use when a chap isn't getting the message if I'm being unwantedly pursued. Incidentally, any woman who thinks it appears 'unmanly' to not want sex all the time isn't worth bothering about, men, like women, do not have a switch that makes them 'dying for it'! x