There is no need to feel aftershock at all. Provided they are meditating during sex! It is called Tantra Meditation. Just apply it after learning and better if both partner learned it before and apply simultaneously to their best for other’s pleasures.
My post on similar lines may be of some help to understand it better:
My favourite meditation that I am practicing last 35 years is Awareness/Mindfulness Meditation during brushing my teeth. Earlier it was a robotic act and I used to think about past or future act/activity/instances etc. By being totally aware during brushing feeling it’s abrasion on every tooth, coupled with sensation of paste etc all thoughts slowly got dissolved and only present moment remained. Miraculous it is, as it engrossed all my activities over the period of time.
