One of the benefits of being in a long-term relationship is that you have someone that you can readily depend on for regular sex. For guys especially, this is a very important part of a commitment to another person. However, it is precisely when you start to expect sex from your girlfriend that she starts using that presumption against you. Some women make a habit of withholding sex from their partners, while some only do it under very specific circumstances. To men, this seems like cruel and unusual punishment. Of course, there is a difference between a woman simply not wanting to have sex and purposefully withholding it. When a woman withholds sex, she’s trying to send a message. Here are some of the reasons she might cut you off and what you can do about it.