Yeah. Never really thought about this since most people are at home to engage in such acts of sin. Sometimes I do feel worn out after sex, but it goes away. If you can, perhaps try to leave it for later in the day when your sugar is high. If you want, you can have an extra serving of nuts beforehand, that should be enough. Don't bother if you feel the slightest odd, you could suddenly get obsessions at the worst time or may find yourself impotent when it makes no sense. If you feel okay, go ahead, otherwise just take it easy.