Every couple has their rhythms and tempos. Typically, the man must be more intuitive and responsive to his wife, to follow her lead regarding when to practice.
However, alchemy is only permissible once a day.
Night time is best for creating solar bodies, although during the day time, the couple can only annihilate egos, not create solar bodies (since the sun is the enemy of generation).
For thirty years I sought God. But when I looked carefully I found that in reality God was the seeker and I the sought. -Bayazid al-Bastami