If i contract with you to build a fence, then you do not build me a fence, I can sue for damages.
Worse still, sex with a specific person is unique. Should the court then be allowed to order specific performance?
Asking for the right to contract with sex as a consideration necessarily involves the government in some sex. I would think that this is an area we should tread very carefully.
Further, can a spouse require sex as part of their marital contract?
I voted no. However i would change that to a yes if we could do so in way that preserved individuals rights, kept government out of consenting sexual relations.