With regards to penis growth it is found in most of the muscle growth story groups.
There is some hetero stuff but it is mainly M/M.
If you want to go that route the total is about 15 groups. There are also groups which are Yahoo groups which feature PE inside the muscle growth or other related things.
You can Google most of this easily.
My computers are at present in transition and as a result I have a been cleaning the info off the old PC and preparing it to run on a new Mac. If I have to I will dig these out and I will have to hand transcribe this stuff for publication here.
Good Luck. . . . .