Men over 30

Grant

Is it normal for men over 30 to not want sex? I always thought that they would, but my husband hardly ever does. He's 37 now and it seems like he only has sex with me because he feels like he has to. Is it me? Maybe he's just bored of me? I try to do things to spice it up, but he's a two position kinda guy. I don't know what to do.. Anyone else go through this?