All Paul is saying is to meet each others' needs. He's not saying no one can ever say "no", or even that your husband has control of your body. He's saying that your body is his, and his is yours, and that you are "one". The Hebrew word behind this concept is "echad"; it's the same word used in the Shema, which observant Jews recite every day: "Hear, Oh Israel! YHWH is God; YHWH is one!" (although they substitute "Lord", Adonai, for the actual God-given textual rendering of YHWH). The first time this word is used, it is used to join the evening and the morning into a complete whole, Day Echad. The next time it is used, it is used to join a man and a woman into an Echad flesh. Yahshua declared himself and YHWH to be Echad.Notes in a private message concerning 1 Corinthians 7.
The ideal is that a husband and wife are Echad, One, and that what pleases one should please the other. If you don't have that with your husband, sex ain't gonna fix it, and the lack of sex ain't gonna hurt it.