Hi Chuck,
I'm not sure the Microcosmic orbit is classified under "Sexual techniques" aimed at converting ejaculation into shooting energy up the spine. But microcosmic orbit does 'circulate' energy in a direction of the governing vessel which is generally up the spine. Also, avoiding ejaculation is considered an energetically favorable practice in nearly every single system since it, supposedly, allows jing to sublime into an energetic elixir which supports the body's vital functions.
Opening the Microcosmic Orbit should be a natural development within Kunlun since those meridians are the foundation and they generally flow in the direction of the Orbit. Since Kunlun "opens our meridians and channels" the result would naturally include open conception and governing vessels. Sexuality and sensuality are also naturally going to increase through ANY energy work because the sexual act is, literally, an energetic practice.
Practices that develop the ability to ejaculate inwardly are usually associated with gripping of the perineum, i.e. PC exercises and intermittent Moola Bandha when 'breathing energy up the spine'. As an aside, I'd like to also suggest practicing your empathic abilities while engaged in any sexual activity since ejaculation is usually accompanied by 'self-consciousness' rather than the tantric consciousness that is tantamount to mutually satisfying engagements between sexual partners.
I'd also recommend the book, Taoist Yoga and Sexual Energy; Internal Alchemy and Chi Kung by Eric Yudelove. This is much more specific to Taoist energy work that is related to Sexual energy techniques. You'll notice that the book treats the Inner Smile and the Microcosmic Orbit as foundational rather than a technique specific to sexual energy.
-eugene