not getting sex from someone that is willing is essentially a rejection to people so therefore I think in most cases is there is a negative feeling about it. Using manipulation and control to get what you want sexually from an unwilling partner will never successfully fill the need for sex from someone because they are not a willing participant and therefore it doesn't make us feel better emotionally. In other words they are filling that physical sexual need but not the one that makes you feel wanted or desired so we're going to feel just as rejected and not valued.

Dont' force sex on anyone, it's not worth it to you, that is, even without taking into account that it's unfair and wrong to the person being forced.