In the course of an otherwise thoughtful post, GUEST (or one of them) told us that:

Some Amish groups have succeeded in stopping all forms of ejaculation for extended periods of time, only to develop cancer from the rotting semen inside their sex organs.

Uhhhh, well, (s)he also said that:

(For, if men don't masturbate, then sooner or later, semen will come out through 'nocturnal emissions.')

So how would "Some Amish groups" accomplish stopping all forms of ejaculation?

Sounds like urban legend to me.