Nzueda,
Thanks for your reply.
In Roma, do as roman does...
I know it is not so easy. I have been only once in an onsen, and only in a man-only bath. I was not at ease at all in the beginning, but it was early in the morning and I was the first one. So, I entered the water and have full time to look at other comers (Japanese) and study their behavior. After a while, I copied them and did not bother to hide myself behind the the small towel so much. (In fact, the habit seems to be to hide himself, but not to take care so much of hiding it a any price).
Someone here told, "I do not want to see old ....", but well, there is no need to look at, I guess.
I have never experiment a konyoku. I guess that since I was embarrassed in a man bath, I will be much more in a mixed one, but I will go on respecting the rule "in Rome do as roman do".
I think there is another point also, esp. in a mixed onsen : If someone wears something, it may sound odd for people in the nude. This should be a deal, a exchange, otherwise it increases the sexual impact.
If I were nude in a konyoku, and if a girl entered wearing a sarong, a big towel, a swimming suit, I would be embarrassed by my own nudity.
If she weared a towel, perhaps I would have the tendency to look at her, to see what she did not entended me to see, and this would bring some erotic tension in the air.
If she were nude, I will probably notice her, if she were beautiful, but quickly consider her as somthing different as a "nude body". Dificult to explain, but the more nude you are, the less sexual it is.
However, I think it is still a bit weird in my mind to go to a konyoku with some girl friends. With a girl friend, yes, with strangers yes, but friend girls of mine... it may so much change the image I have of her...?
Do you experiment going to a kon'yoku with some friends ? Does it change the relationships?
Best regards
Ludovic