<human>: Can you provide a brief overview of the text?

I (a female) will be student teaching this semester, and my mentor teacher (a male) has already told me that he likes to conduct his class in a rather "GOTCHA!"-like way and that he expects me to do the same.  Basically, this involves asking questions and calling on students that don't seem to be paying attention to answer and sometimes having them come up to the front of the class.  I hated when teachers did this in high school, but I don't really have a choice as this is how my mentor teacher conducts his class.

Based on stories I have heard from my brother, my boyfriend, and guys on Reddit, there can be nothing worse than getting called up to the front of the class/to the board when you're sporting a surprise boner.  Therefore, I want to avoid this at all costs.

So, Reddit, please enlighten me so that I might avoid calling on these kids and potentially ruining their day/week/etc.  I've noticed some of the obvious ones, such as placing a textbook in your lap or putting a sweatshirt in your lap, and I'm sure I'll pick up more once I actually start teaching.  But I need your help to avoid embarrassing my male students.
<bot>: Teaching this fall.  Please, enlighten me as to your boner-hiding methods so that I, as a female, can do my best to avoid embarrassing my male students.