I used to know this “mAn” who even though he was married thought he was free to do as he pleased with other women.  He hit on one of my friends and she told me that his opening line was, “I’ve had a vasectomy, so I can’t get you pregnant”, what a turn on, not.  He didn’t say anything about not giving her STD’s though.  Generally it helps to have some sort of actual attraction and not trying to promote that because you got your junk fixed it will be a great opening line to increase your opportunities to get laid?