There is no comparison between the two. In one case, a husband and wife negotiate the times and frequencies of sex. That is a legitimate part of marriage.
In the other, someone has stolen what isn't theirs. It is not different than shoplifting.
And I can assure you, no spouse in America readily agrees to NOT have sex any more. And I wasnt talking about only getting it a couple times a year, im talking about spouses who refuse to have sex ever. And trust me, it happens far more than you would ever guess.