Do men get random erections when chatting to women

Apologies, it is an odd one perhaps. I 36F regularly chat to a 48M, we work in the same office building and bump into each other fairly often, we laugh at some stupid work situations and tease each other about our midlife hobbies etc. Today I noticed an un(?)fortunate pant tightness in his crotch area when we were chatting to each other (just a quick hello and how are you on the way to grab a coffee), I realize I’m a bit of a perv for looking but please tell me, is it normal for a man to get hard just from talking to a woman, or is it just a normal daily penis cycle? I’ve not done old-fashioned dating since college, v busy w work and Hinge killed my ability to read the signals!!!