Do guys get less horny over time?

So, when I start dating a guy, I think it's trashy to sleep with him immediately, I usually wait until we are exclusively seeing each other. The guy is always so excited to have sex with me, and once we do, everything goes fine. A little while into the relationship, he just doesn't want to do it as much. I've asked if it's something I'm doing, if we should try something new, etc, but these guys always say, "no you're great, I just don't feel like it." wtf? I don't want to come off as a nympho but any thoughts on why this happens?


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