In our society, going to the strip club is considered by some to be a "rite of passage", one on a long list of "being a man". All it is is harmless fun with friends, in this case, his brother. I doubt this is anything more than a brotherly bonding experience.

I think you need to keep your insecurities in check. Nothing happens in these clubs, besides the fact that your bf's brother will probably shell out some dough to get some entertainment. It's not like he's taking them out to dinner, and then back to his place. Consider it akin to watching a performance, a play, or even a movie. Would you get upset if your boyfriend watched a raunchy movie?

What are you going to do when he starts going out to bars drinking with his friends and brother? Worry and fret that he's going to take someone home? Call him 20 times a night?