I think Public Sex is going to be bigger than many realize. It's certainly my favorite when combined with gokkun.

Idea: Semen starved MILF leaves the house during the day and tries the suck/swallow the whole town. Arrives home at the end of the day, happy and refreshed and ready to cook dinner! The public venues are endless.

Idea: Semen starved female office workers go into 'special restroom' where gloryholes have been constructed, have 'lunch' and return to their desks smiling and refreshed.

The scenarios are endless; just keep it classy and leave out the misogyny.