I do not know much about this, but to me, sexual energy is very related to love and connection (not always, but still...).
Sex, in its most pure form, is a way to express love, attraction and connection in the physical reality. And, is not Source energy Love itself?
Metaphysically, love is the strongest creative force. Some people understand the magnetism of love energy as "the law of attraction". Others see this energy as an electro-magnetic field which creates realities.
So yes, sexual energy is closely related to love energy which is creative life force. There seems to be a connection in there. But I also believe there are several ways to express Love energy besides sexuality.