Breaking the stereotype-men are the ones who don't want sex

My husband and I have been together for a few years now. He's my everything and I adore him and I know he feels the same way. Our relationship was a whirlwind and started very hot with us having sex multiple times a day. Then slowly it started to slow down to a couple times a week, twice a week, and now maybe once a month. I was chatting with the wives of his friends and they are all in the same boat. We women feel like sex crazed maniacs and it's the men who "aren't in the mood" and we catch them with porn later. I spoke to my husband about it concerned that he had lost his attraction for me or that we were becoming boring.He states it's always the opposite. My husband has gained some weight since we got together and he states that sometimes sex is just hard for him. I've always been a very sexual person and I've been totally okay with it-but it's also driving me crazy! Are there any other ladies out there who feel my pain? What are some tips to help? Again I want to stress I'm not worried about our relationship it's extremely solid. I want him to feel comfortable with his body but there's gotta be a way :)