I've never heard of anything like that happening in a bathhouse. There are so many people around.
There are good bathhouses and bad bathhouses.
A good bathhouse will have a friendly staff, be scrupulous about cleanliness, and foster a friendly and safe atmosphere. It really makes all the difference in the world to the experience you have there.
Go to
bathhousea ddict and read the FAQ and the etiquette guide. Go to
Squirt and see what other guys say about the place. The one in Adelaide rates 4/5 so that's very good. Bring a buddy if you feel like it. Any reputable place will give you a tour of the facilities so you can see if they're to your liking.
If you decide to stay, be sure you've memorized the advice in this post and follow it. You'll have a great time if you do.