Also known as pre-cum, is a fluid that emerges from the penis when it is stimulated. The accessory sex glands shape it. These glands produce semen differently from the prostate and testes. Sperm are not produced by the accessory sex glands. There is no way to stop pre-ejaculate from coming out of your penis, and you cannot feel it. What Is Cumulus? During sexual arousal, a clear, mucus-like liquid appears at the tip of the penis.