In defense of Matt356, English is not his primary language. So his explanation may not be as clear as it could be.
1. I want to ask you the following: Is it a FACT, that, like you stated above, when one is waving his penis (thus engaging the BC-muscle), the IC-muscle automatically comes »into play« - which would mean that all the confusion from the thread mentioned above can thus be fairly simply resolved?
As Matt356 points out, the BC (bulbocavernosus, but more correctly the bulbospongiosus) muscles help force urine and semen through the urethra and also help the corpus spongiosum become harder during ejaculation. The IC (ischiocavernosus) muscles compress the inner parts of the corpora cavernosa and make the main erectile chambers harder during ejaculation. Both are innervated by the same nerve.
See this table:
The BC/BS muscles (there are actually two, one on each side, but they’re interconnected and work as one) are larger and closer to the perineum and therefore and may be easier to discern and control consciously. But they all receive the same nerve stimulus and contract at the same time.
2. Can one or can one not »shoot farther« with a strong BC-muscle? (And, if it is not too much of drag for you, could you explicitly write down the benefits from having a strong BC- and a strong IC-muscle? (Or both?))
Well, the benefits, as pointed out by Matt356, is harder erections. Also, having a stronger BC/BS muscle will, or should, force semen through the urethra with more force. I believe there is a limit, however. It may be possible for too many kegels to cause the BC/BS to enlarge and actually constrict the urethra during ejaculation. That may not be a problem for very many, but it’s my believe (and not proved scientifically) that it could be a problem.
So daily, multi-rep sets of kegels may be beneficial for men who have never done them. But too many may cause problems. I’d suggest once you see an improvement in erection quality and/or ejaculation strength that your kegel exercises be done in a maintenance fashion (once or twice a week, or less) to avoid problems.
This last bit comes from my personal experience. I did kegels quite a bit over the past few years and now my ejaculations “feel” strong, but the semen only dribbles out. (I’ll be 60 next year, so that may have something to do with it.)
If you’re out to make babies then dribbling semen will work just as well as semen that’s shot out in a jet. If you’re going only for the visual effect, then you might want to consider a moderate kegel routine rather than a very strenuous one. Either way kegels will help with erection quality and strength.