Sometimes in case of casual sex, research indicates typically the woman set the boundaries. In that case, if she’s not interested, nothing will happen.
But, The Norwegian University of Science and Technology’s (NTNU) Department of Psychology associate Professor Mons Bendixen says, “When men and women in the study met, about half of the men said they were interested in having sex with the woman, whereas most women were uninterested initially.” An woman basically have little interested to do casual sex, if she finds the man is attractive. But, when a man gives the impression that, they wants to have sex with anyone, anytime, it is not that type of man what most women are looking for. This could be a reason of why men sometimes act less interested in time of sex than they really are. The most important factor is if the man had many sexual partners previously, this could contribute to their being perceived as sexually attractive and available.
Professor Leif Edward Ottesen Kennair in the same department said, “Men who are overly eager do not come across as attractive”. Also, the researchers says the whole thing is a tactical game. Men and women’s real intentions may be little different which, we might knew from the signals they send each other. In some cases, women might pretend to be a little more interested than they actually are. Kennair says about the tactics that, “We think this may be to keep the man’s attention a little longer.”
Also, Professor Martie Haselton of UCLA says, “The exception to this general sex difference is when the woman is as interested as the man. In this case, women also pretend to show less interest. Both men and women who are truly interested in a partner might be trying to ‘play it cool.’ In economic terms, it’s about supply and demand. The most in-demand people are not the most available—they are a rare commodity in the mating game. Women and men can also avoid some of the sting of rejection if their partner is not actually interested in them”