my boyfriend senses when I masturbate??????

So like any woman, I'll masterbate when I'm extremely sexually frustrated and I'm all alone. But hours later when my boyfriend comes home and once everyone is asleep, he wants to have sex. Like, to me, it seems like deep down he has a radar or something that says "she masturbated. now you have to get off." But he'll have no clue that it actually happened. Hell just want to have sex. And it happens every time. Am I the only one this happens to or...???????