Yes, I have his phone number. He has mine as well. The classes that he teaches are part of the psychology curriculum. Also schools here teach sex education, so I don't have a problem believing that claim. Although I did ask if he taught other classes as well and he said no, but he said he has taught 8 different variations of the course depending on if it were at the graduate level or undergraduate. He said the graduate level is much more detailed and explicit for students going into clinical psychology or marriage/couples counseling.
Something else I found a little odd, is that he says he's been teaching for 20 some years yet he tells me he is only 44 years old. He has a PhD, so that means he would have had to have started college much earlier than most people unless he started teaching right after finishing his undergraduate work, and completed the doctoral degree while teaching (which on second thought may not be that unusual).
Sounds like I should ask him to connect a few dots for me before agreeing to meet him in person, but I'm thinking he might be more likely to give me straight answers when I'm sitting talking to him face-to-face rather than over the phone. That way I can read his body language too.