According to a small study of 174 participants from 2014 published in The Canadian Journal of Human Sexuality, having sex on day one actually increases your desire for it on day two. It’s also possible that the opposite is true—that not having sex has the impact of making you want sex less generally. Some people may find that this makes it more difficult to turn on, even if you want to. Unexpectedly, going for a lengthy period of time without having sex can cause you to completely lose interest in it. The more sex you have, the more of it you crave. Your libido is increased by regular sex.