Erections
I get them. Particularly when I'm tired, bored or sleepy---which is usually during biology. D probably thinks I have a hard-on for the Krebs Cycle. I, meanwhile, must constantly think of ways to move about lab without having to stand or walk around. Lately I've been squeaking to and fro on one of those swiveling stools, the kind with the little wheels on them. Professor T. is probably beginning to suspect something is up.