"Bb sex can be paid for by both male and females.
Next thing you know your cute innocent wife is being cream pied ..."

Your analogy is interesting

But as we all know, the odds of your partner/girlfriend/wife seeing a male gigolo, masseuse etc is probably 1:100 000

Compared to the odds of your partner/girlfriend/wife just going on Facebook and looking up an old boyfriend - much easier (odds 1:500), or getting to know the tradesman well (odds 1:1000)

These are all arbitary odds, for the point of this discussion

Because if a mans partner/girlfriend/wife was really interesting in seeing 'working men', the man could negotiate a fair agreement so he could see 'working women' as well
And everyone is happy