You guys sound fairly certain that your permanent gains have been adversely affected by ejaculation. How did you arrive at this conclusion?
Ejaculation may prevent achieving subsequent high erection levels but how does that affect accumulated gains? My cock shrivels when I'm exposed to cold air, does that indicate that I'll never return to my pre-exposure length and girth?
I've cum buckets in the course of learning some of these techniques in the past two years and every in/cm I've gained seems to be sticking. I think that, as in everything, keep it in moderation. Don't set out to make your workouts into j/o sessions, but if it happens, go for it, then, as ItsElectric and DLD have said, do some stretching. Kinda messy, but okay!
By the way, neither ejaculation nor masturbation expend energy producing sperm; you are constantly producing sperm.
Cheers:
dewey