Its weird because some people are born with legitimate lisps because they have an issue with the way their lips and mandible/maxilla formed and other issues.I think the development of the lisp is more where they grew up and who they grew up with. If someone is surrounded around by a lot of females, I think men will start having a lisp. I mean, some people are born with that shit. But, I guess the more you purse those lips around that hard thick cock, the stronger that lisp is. Women are weird.
But there's a subsegment of gay dudes that like choose a lisp as an affectation or expression of their sexuality.
So your theory is they hang out with the ladies and they're trying to sort of emulate how they perceive the women to talk?
Its an interesting premise I think might actually be close to the truth.