Getting aroused in public

I know sticking it straight up leaning up against your belly has saved me many embarrassing moments. Give it it a try

 

Make sure you don't spend too much time thinking of it, as thinking of arousal often leads to it.
I've had similar concerns, but the bulge really isn't that bad most of the time, and most people will just assume it's the fabric folding and not anything else.
If you can wear a longer shirt, that could help conceal anything that people might see. You can also try wearing briefs and heavy material like denim to keep everything where it belongs a little better.
I've heard that flexing your leg muscles can divert blood flow pretty well too.
I've found that picturing bugs (cockroaches are my go to) crawling all over my food works the best for me. And when I can't do that, I curl my toes to give myself a foot cramp.
Since you have to be talking to them, it may be easier to imagine them as wrinkly old ladies.

 

Basically, the more you don't think about sex regardless of how heated a situation can be is very beneficial to your relations, have no desire for sex and see women come to you wanting it. Be as professional as possible imagine you're da Vinci or Nikola Tesla, a man with a solid backbone. Forget about measly things such as arousal.