well if ur being honest about wat ur saying, yes it technically is wrong.. think how u would feel. would u like ur husband to find younger, hotter, tanner, thinner women to have sex with??? the point of marriage is to be loyal, honest loving and commited, and it sounds like ur breaking all of those vows. however, if u talk to him and be honest with him, see how he feels about it. some people are into open relatinships, so maybe he can go out and do the same thing ur doing and u guys wouldnt have any problems??
u should be honest with him, if u cant be, u shouldnt stay married to him