I have multiple european Sauna experiences to share. I've been to these places probably 30 hours in total, so obv I've seen a lot and experienced a lot, but some events are more memorable than other.
1.
First time ever, with GF. First time we entered the sauna, my GF was very shy and nude under a towel covering herself up. After a few minutes a girl comes out of the woman showers, takes off her towel and stands outside the sauna in front of the window into the sauna. She puts her hands behind her head and just stands there naked in all her glory. She was around 25 years old and really hot, had a trimmed bush. Then she came in, layed down in sideways position with head on her BF's lap. I was now behind her and could clearly see her ass and pussy lips from behind for 10 minutes. That was hot!
Later they went out and it was just my GF, me and 2 other guys left in the sauna. My GF was still very shy and covered, but when we were about to go she let the towel all the way down so that the guys saw her naked for a few seconds, then put the towel back up. She was shaved. That was the first experience where she was nude, and I saw that the other guys clearly looked at her pussy.
2.
Same time as first time. We went back to the sauna. This time there was a girl laying on the bench on her back, all naked, tanned, normal body and had a shaved pussy. What was really hot was that she had pierced her pussy, and she was somehow laying the "opposite" way of what most women do. Most women lay with the pussy towards the wall, probably due to shyness, but this girl layed the other way. Also she spread her legs at regular intervals so I could really see everything.
3.
Alone. Attending a group sauna, some kind of aufguss extreme that got really hot. The sauna was really crowded, and I sat next to a skinny blonde naked girl approximately 22 years old. She was very hot, and the room was really hot. We were sweating a lot, and after a while it was almost too hot for me. She looked at me and smiled. I also saw that she looked at my cock, and I looked at her pussy and tits. That was it and soon she left.
4.
Alone. In a hot-tub with room for approximately 6 people. There were 4 people in the hot-tub, me, another guy and a couple. I was naked, but everyone else had bikini/shorts. Then 2 girls came to the hot-tub, both were not much older than 20 and were giggling a lot. They were obv really ENF when they took the towel off and both came nude into the hot-tub. One of them had full bush, the other one was shaved. They were really acting ENF all the time in the tub, then when the hot-tub shut off and the water gets clear they got really embarrassed and started laughing until it got turned on again. They were in the hot-tub for around 15 min, while I was having a good time and mostly looking into the water in front of me (towards them). Then they started looking at me, like they were waiting for me to look away before they got up. I pretended I was in my own world, just relaxing and looking at the bubbles. Then they got up and I saw the shaved pussy up close one last time before they left.
5.
Alone. Met a really hot dark haired, skinny girl in her early twenties naked in the corridor. She had really hot tattoos and a landing strip, medium-small tits. Saw her a few minutes later in the hot-tub with her BF. Went into the hot-tub sitting next to them. They got up around 10 min later, she went out last after him. I was directly behind the ladder and quite low, and got the most awesome look at her ass / pussy from behind ever.
6.
With my GF. It was late, about 30 min before they close. We found this japanese shallow, clear and hot water culp outside that we layed in. My GF was laying on her back, resting her head on my torso. There was just the two of us, plus another man that sat directly opposite of my GF. I saw that my GF spread her legs quite a lot and just layed there, wiggling her legs back and forth towards this man. I saw that he was obv looking at her open pussy and got turned on by that. I think my GF did it unknowingly or maybe she liked it. After 10 min, she meets his eyes and sees that he looks straight up her pussy. She closes her legs and whispers it my ears. The man look embarassed because he got "busted" and left.
7.
Alone. Participating in an event where 8 people share a sauna/shower for 45 minutes. You have to be naked. And unisex. You put on scrub, then shower off, then put on some clay, then shower off etc... The shower stalls are open and arranged 4 on each side facing eachother. There were 4 girls and 4 men. 2 of the girls were very young, early twenties and had trimmed pussy hair and small tits. Then there was 1 girl that was hairy and seemed very open-minded. It was really nice to see these ladies naked for 45 minutes in many positions, but most notably what I remember is one of the young girls spreading her legs in the standing in the shower and then sprays water up there for around 5-6 seconds (probably to clean off the clay). Somehow that was really hot to watch. The open-minded girl was quite fun, because she was there with a black man that had a real BBC. At the end me, 2 other guys, the BBC and this open-minded girl were talking together in the communal area. All of us naked while applying skin-lotion to our bodies. I wonder if the BBC was her boyfriend or if she was a hotwife or something.
8.
Getting a massage with my GF. We were both naked laying on the table, face down. This was some sort of turkish bath, so there were no towels on us. Two guys came in and massages us at the same time. So there was my naked GF, naked me and two naked guys close together in the same room. GF getting touched everywhere from one of the guys.
Then we turn around on our backs. Takes about 10 seconds, then we get a small piece of cloth on by cock and her pussy. She lays there topless, and a small piece of cloth on her pussy, and gets the rest of the massage. Afterwards she tells me that he used his towel and brushed her pussy once with it, and that he also touched her tits during massage.
I may remember a few more episodes later. If so, I'll write them up 
.