A couple of months ago I got an email from someone who claimed he caught an STD from a spa. I don't know how he knew he caught it there, but if you're messing around with other guys there, you could be catching an STD, or spreading one, and not even know it.
Seriously, people, if you're fooling around at all at the spas, or even if you're sexually active at all, get tested regularly. I usually go to the LA Gay and Lesbian Center in Hollywood. It's free and you don't need an appointment. Some of the counselors there are really cute, too.