Most of my friends don’t know, or if they do, they aren’t saying anything.
There are two main ones who know, one is a friend I dated so naturally that would be discovered in that previous relationship.
The other is a guy I know in real life and we both have tumblr. Before tumblr’s crazy nsfw ban, I used to run a relatively well sized nsfw blog separate from my main blog where I did post some pics of myself. While I made sure to keep the two blogs entirely separate, he discovered my nsfw blog and told me he knows my “secret” and that it’s safe with him haha.
In particular, this is the photo he brought up.
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And another guy who is my boyfriend’s friend also learned of my endowed size by stumbling across my nsfw blog. He’s actually here on lpsg too haha, but while he has a good side, he’s on here mostly in the supporter/enjoyer of endowed guys aspect.