Said I'm straight all my life, is there any thing I should know should know or worry abt if I hook up with a gay guy.

Wear a condom.

Just enjoy. I still call myself straight and I've sucked and fucked more men than I've slept with women. It's whatever makes you cum.

^^ This ^^

And your gay friend will probably be happy to discuss up front what you do or don't want to do.

If you're married, make sure they have a partner. They will be more discreet and more than likely not have STDs. Then let them suck your cock. I had a gay man sucking my cock for 8 to 10 years once or twice a month until covid hit. Best head I've ever had.