Are all guys this dumb sometimes?

So my boyfriend found out he has chlamydia, he got it from a girl he slept with before he got with me. I had an appointment the other day and was treated so we can't have sex until he has his appointment and takes his treatment and waits the 7 days. We'll yesterday I was over and he's always super horny but he knew we couldn't have sex or oral sex so I just kissed up on him while he jerk ed himself off. While he was doing that he asked me if I would get it again if I was just to suck his dick but not swallow the cum and when I told him I would still get it he looked super confused. I was actually kinda shocked with that question, he's never asked anything so dumb before. Do alot of guys do this because they don't know alot about STD's or am I just the one will a not so smart boyfriend.