Aloha Burqhah,
Looking back at it,
Gallen's answer in the Sex & Qigong post is sound.
There are many layers to answer from with a question like this, and many "best" answers depending on one's situation, training, and goals.
There are many qigong books where sex can be used to enlighten, heal, and energize.
Look at what is your purpose/intent for the energy work (Qigong) before or after sex? How does sex figure into this purpose/intent? Are there sexual techniques that can be used as a vehicle to support and further that purpose/intent?
Much Love, Shawn