I would never meet with a guy if I knew he wasn't 100% all there. Some would, I guess, and I think they are putting themselves at great risk. What if the guy gets too attached and doesn't want you to leave and fights with you over it? Your S.O.L. because this man doesn't have the mental capacity to understand that your only there as a NSA short term girlfriend. The risk would just be too great to meet guys who are mentally deficient. Do I think it's immoral to meet with mentally deficient guys? No, I don't as long as he understands what this is about. But I do think it's unsafe for the provider because theres the risk of him going off the deep end.
-Take this for an example. I once met this great guy but I could tell he was a severe manic depressive. The first time we met, he told me how much he liked me. We got along. After our date, I went home and he continued to email, call and text. Now I don't mind keeping in touch with guys, actually I enjoy it. But I just can't always respond immediately to emails and stuff, and it was starting to upset him. Realizing this guy was a severe manic depressive, I told him I thought it best that we no longer communicate. Basicly, he couldn't handle the hobby and I saw this in the beginning. So sometimes it's best to end communications/meetings with people because if you don't the consequences could be terrible. The last thing in the world I would want to do is make him go off the deep end because I can't be there for him every minute of the day.