Aquarius is a bathouse if you haven't noticed so most of the clients are gay or at least bi.
I've been there a few times by myself and with a female friend.
Don't get your expectations up to high and you'll be fine. I've had a m/f couple invite me to their room so he could watch me bang his wife. That was fun. Finished and showered and left.
With my female friend it was ok but at the time no one was there that was suitable to join in. It can be quite the weinie roast but that's to be expected. There has been other good looking couples but the times I go there it's by myself and there not around when I have my female friend.
The good looking couples tend to be a little more picky. Understandably so. If your looking for a couple to join it's possible depending on your standards. It's always possible for a guy to join in as there is no short supply of them. If your looking for the voyeuristic experience you can have that too. There wouldn't be a shortage of people watching.
Go and enjoy yourself. What's the worse that would happen? You see some guys in a towel. Nothing worse than going to a gym. Except they might hit on you.
Maybe there will be a good looking couple you can hook up with.
Hope this helps.
SlimShady