Sex life

So I'm horny all the time, it was never like this when me and my man first got together 6 years ago, he was always the one that wanted sex all the time.. But starting maybe 2 years ago till now I've been super horny all the time and my man don't want sex, it's like I have to beg him.. And it's not like we have sex all the time anyways so I know he can't be bored or think we have sex to much, but literally I have to argue with him just to get intimate. Anyone got any suggestions why or what I should do about this heightened sex crave?