It's 100% true that there is a huge difference between wanting to feel sexy in oneself and desirable to others, on the one hand, and wanting sex on the other.
But there are complications, for example ...
Sometimes sexy-looking women actually do want sex - though not with any old partner
Some young women exploit their sexuality, giving the impression that they are more interested in sex than they really are, usually without having the faintest ideas of the risks they're taking by doing this
Media images of women continually and deliberately confuse the two issues, suggesting that sexy-looking women are also available for sex (if you buy the right body-spray, drive the right car, etc, etc)
It can be very frustrating for a woman who has made an effort to look desirable if no one even signals their interest, particularly if there is someone she actually wants to attract, and ...
The only way a man can be sure whether the woman he is with is just feeling sexy, or wanting sex with him is by making a move on her ... which can cause problems, to put it mildly.
BTW ... before anyone jumps to conclusions, NONE of the above justifies or excuses acts of sexual violence, harassment, rape, etc ... I'm just pointing out that real life, and real sex get complicated sometimes
