Semi- hard

I've been dating my man for a year now but I've noticed something. He only gets semi-hard.

Hard enough to have sex, but not like ROCK hard anymore.

I still wear sexy things and do a lot of foreplay with him, etc. so I'm not sure what the problem is.

This hasn't been a problem in my past relationships at all, so I don't know what to make of it.

Have any of you women had this experience? Please share! Thank you!