We had our sensual massage last Sunday, so we can relate our experience for you. You strip down and wear robes, sip tea, etc to relax while you're waiting for them to get ready. After 10 minutes or so, they'll some out and take you back to the treatment room. Relaxing music, seductive scents, the whole bit. They have you lie face down, side by side. From there, they'll work on you with a very light touch, through cloth, with oil, etc. Then they'll have you turn over, eyes still covered, and work on your front. For the guy, expect very light touching down there, but not much more. Yes, they use a feather. I almost broke out laughing when she blew in my ear, but it was all fun.
At some point, she'll direct the guy to start stroking himself to get ready for the main event. I imagine they may do more for the woman, but the Mrs. checked the boxes for the private areas...not quite ready for that yet. Eventually, they'll have you reach across to each other so you can play with your mate across the tables. As you reach the point where they move you together, they push the tables together. Holy crap, talk about a jarring experience!
Remember, everything is very quiet with only music and whispered commands. Then suddenly, wooden tables are being scraped across tiled floors with a sound one would make rearranging the living room furniture. They need to work on that.
At that point, they can either stay and continue massaging you while you finish off, or as in our case, they quietly leave the room. Afterwards, you can use the spa, shower, etc. We must have taken too long, because as we were getting ready another couple came through on their way for their turn. It was actually a funny experience, because about 10 minutes later, the woman in the couple came back out to pee. She looked pretty frustrated about that! So like you tell the kids, make sure you go before you leave.
Overall, we enjoyed it. It was part of our package when we purchased our vacation, so I'm not sure if we would have bought it individually without the deal. It's one of those things I think you just have to try once for the experience. Have fun with it!