Now, on to this...
The alternative is to question those relationships and whether they're healthy or not...There are a lot of relationships that are de facto prostitution, with sexual favours being traded quid-pro-quo for household chores or emotional labour or other, different sexual favours... or simply as a prerequisite for remaining in the relationship (or in the house). That's one of the reasons I'm in favour of safe, decriminalized sex work - it'd be hypocritical not to be.
Consenting adults, behind closed doors, and all that... but if an intimate relationship isn't founded on basic mutual affection and giving without strings attached... I'm pretty sure it's not a relationship that I understand, or would ever want.