There is no worse let down for a man than to be in an amazing sexual experience only to be turned off by something that his partner knowingly or unknowingly does to send his arousal from seven to zero. Through a poll of about 100 men, I have compiled a list of the top five things women can do to turn men off during sex, and all of these things can be avoided with proper preparation. Take a look at what men are saying will send their libido south during sex.