I really do think that there is potential in a story about cheating or public or otherwise secret sex scenes that would be taken in a more serious route rather than the blatantly silly version that porn industry does (because it is easier.)
I think in general that's something erotic stories do best. They let you live out fantasies without serious consequences. Risky sex, harsh sex, taboo sex, you can have it all. And even when 'you' get caught, no real harm done!