Don’t sweat it too much. My wife, who was then my girlfriend, went NAKED at a beach in Hossegor (Southern Atlantic coast of France) once when we were there around 1990. I got out of the surf after a great session and this hot naked chick saunters up to me and it’s MY GIRLFRIEND! I immediately started looking around wanting to cover her up, but eventually realized that the majority of the girls/women on that beach were also naked. You just have to let it go…
Oh, and we’ve been together now for 17 years (10 of those married), so don’t worry about it.