These are three different things that must be seen each in its own right.
Firstly, sex and yoga: as far as most yogas are concerned, including Sri Aurobindo’s Yoga sex is seen as an obstacle. This is not so much because of moral reasons but simply because spiritual life means turning the consciousness and vital energy higher upwards and deeper. Sex, on the other hand pulls it outwards and downwards. This is so because of the pull towards the body. Bodily and vital pleasures are at crossroads with the higher aspiration and spiritual Ananda….