Me and my partner don't have sex often.

I've been with my partner for two years now and our sexual relationship isn't as active as it used too be. If im lucky once or twice a month is when we have intercourse. He isn't cheating I'm sure of it! I sleep next to him every night ! I know he loves me and i love him but the sex just isn't really there anymore. I just wanna know other women's opinions and if this happens to them. If so, do u recommend something to fix it.