Why do the husbands get shamed when they aren't ready for intimacy?

Seems to be a fairly consistent occurrence on the show, when the husbands want to move things more slowly/aren't ready to do something sexually they often get hammered by the experts and the other contestants. If the wives become upset over this then people generally take their side and pressure the husband to give in to what they want.

It's a really strange dynamic I think, it just seems to play into the idea that the men should just be sex mad from the outset and if they aren't there must be something wrong with them.