The Relaxed Wife - one big euphemism?

[Phileaux]

It's probably just me, because I see sex everywhere, but when the wife was giving the husband instructions on how to relax it sounded suspiciously like a tantric sex guide... I was wondering if this might be like "Women's Back Massagers" where everyone knows exactly what it's about, but they have to run under cover to keep the prudes from getting upset.