Have you ever

I don't have a sister, but there was a time when I was about 8 or 9 & I walked in on my 2nd cousin, who was probably about 14 or 15 at the time. I can still remember, to this day, the image of what I saw - with her lying naked on her bed, legs apart, knees bent, frantically rubbing at her vagina.

However, having been raised in a naturist environment I wasn't bothered by the sight of her being naked, although I was obviously curious about what the rubbing was all about, still being too young to understand anything about masturbation. In fact it wasn't until quite a few years later that it dawned on me what it was she had been doing.

She didn't seem that bothered about my having seen her either - she didn't even stop. She just told me to get out & knock on the door in future.

I suppose that where my own mother was very overt about masturbation once I entered puberty, I suppose her parents (my Great Aunt & Uncle) may well have been so also.