How Semenax Works Semenax is a natural climax enhancer. As we’ve alluded, it’s made to naturally increase your natural semen production. Yes, that’s important for our intents and purposes, because when you have more semen to ejaculate, your orgasmic muscles climax longer and faster. Semenax So it does the following: Boosts Semen Volume Forces Climax Muscles to Contract Longer and Faster Gives You Better Orgasm Control Allows for a Bigger Climax