據報導班艾佛列克（Ben Affleck）先前宣布已向珍妮佛羅培茲（Jennifer Lopez）求婚成功，小倆口被爆料簽下了婚前「性條款」，要求必須「一週行房4次」，引起熱烈討論。（發燒話題）
該婚前協議如果在臺灣有效否？上開契約假如有一方不履行，另一方可否起訴請求履行？如果要起訴請求，應提起給付訴訟？（性質上係要求一方須作為）；即便可以起訴請求，法官是否會認為該契約違反公序良俗而無效，而以判決駁回原告之訴？（無訴之利益？欠缺權利保護之必要？）
婚前契約，在美國係常見的，尤其是顯見在一些名人、富豪；婚前契約英文係Prenuptial Agreement

以下介紹美國法的婚前契約，作為評斷上開契約在美國是否有效。

Would you ever sign a sex contract?你是否曾訂立性愛契約？

A British woman pondering this question recently wrote to the Daily Mail for advice. Her boyfriend refuses to marry her unless she agrees to have sex with him at least twice a week. It seems he'd like to put the agreement in writing.

She wants to know whether it's a good idea for a prenup to include sex. But what she should be asking is whether a prenup can include sex -- legally?

Prenuptial agreements are supposed to dictate the state of financial affairs should a couple divorce. But they've recently expanded to include chore agreements and clauses involving the nasty in-laws.

Some couples also include sex.

Doing so is not illegal unto itself. However, it's unlikely that such a provision will be enforced -- even if both parties are consenting adults. Most courts would still refuse to enforce the clause on public policy grounds.

This is because a prenup that includes sex is in fact a sex contract. You generally can't contract for sex, whether it is for money or a requirement of marriage. A sex contract deprives an individual of autonomy and the legal right to control his or her body at that very moment.將性愛納入婚前協議，事實上就是一個性愛契約。一班而言，性愛不得作為契約之標的，諸不論是為了金錢或是為了婚姻。性愛契約剝奪了一個人性自主權及在特定的時間下合法支配他或她身體的權利。

If enforceable, a sex contract would punish a person for saying no.
假如使性愛契約變成可履行的，那將處罰說“不”的那個人。

This doesn't mean you can't get divorced when your sex life wanes. You can, but you probably won't be able to hold your spouse to the terms of a sex contract. So instead of thinking about a prenup that includes sex, you might just want to think about ways to keep your marriage passionate.
這不意指，當你的性生活逐漸衰退，你不可藉此提出離婚，你仍可以；但你不可以持著性愛契約去主張（意即不得持性愛契約去作為綁架配偶的籌碼）。你總想者如何訂立性愛契約，倒不如想想如何維持婚姻關係之熱情。