CALIFORNIA FAMILY LAW
...Unmarried Cohabitors
......Agreements Between Cohabitors
.........Defenses
............Based on Sexual Services
4 Cards On This Topic:

Express K between unmarried cohabitors enforceable, except to extent explicitly founded on consideration of meretricious sexual services.

If K includes multiple types of consideration, including sexual services, but sexual services part of K severable, balance of K will be enforced.

Absence of cohabitation means no consideration severable from sexual relationship.

If rendition of sexual services is inseparable part of consideration in cohabitor's agreement, agreement is unenforceable.