Haunted, One of the things that we see with someone in MLC is that they experiment w/different things. It's that let's go back and try that one more time type of deal. MLC is about depression and w/depression comes some addictions such as alcohol, drugs, gambling gaming, sexual encounters and the list could go on and on, depending upon the individual. If your h didn't have a sexual addiction prior to MLC, I would venture to say it's part of the journey he's on right now.
He's a teenager at heart and is acting like one. He's searching for women and what he's doing is contacting them, checking them out and then bragging about it. He likes the attention they give him and trust me, it's stroking his ego 100%. Of course, there is always the possibility of catching the gift that keeps on giving if he's not using protection, as well as a child down the road...I can understand your concern, but you can't control him and unfortunately, he's not going to listen to anything you have to say about it. Right now, you are his mother to his inner child.
My xh during the early stages of MLC was like this. Every time he saw a woman looking at him, he thought they wanted him. He talked about women all of the time and after he left, it was discovered that he was talking to women every day from all over the world bragging about what he had, telling them how I misunderstood him, etc.
If you don't know anything about sex addiction, then do a search on the net. The net if full of valuable information. This is how I first learned about MLC...doing a search many years ago. Knowledge is power and the more you know about MLC and depression, the better you will under your h's journey.
Always remember...you didn't break him, therefore, you can't fix him and/or control him. Keep the focus on you, your family and things that you can control in your life.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.