In the esoteric tradition of pure sexuality, the word semen refers to the sexual energy of the organism, whether male or female. This is because male and female both carry the "seed" within: in order to create, the two "seeds" must be combined.
"Whosoever is born of God doth not commit sin; for his seed remaineth in him: and he cannot sin, because he is born of God." - 1 John 3:9
Clearly, this cannot refer only to males, since females must also have equal access to the second birth; therefore, remove the gender from the quote.
Woman must restrain the sexual act and withdraw from the man before the orgasm in order to avoid the loss of her seminal liquid. - Samael Aun Weor, Igneous Rose
This "seminal liquid" is energetic, spiritual. It is lost through the orgasm.
Woman, avoid the orgasm during the sexual act and in this manner you will awaken your Kundalini. - Samael Aun Weor, The Major Mysteries