First of all, I know that cum -> semen has been brought up before. I'm bringing it up again because now that we have bulk aliases, it's feasible to do it without too much work. As far as I can tell, it being too much work is half the reason it was never done.
A couple notes:
- More cum_on_* tags have sprung up since the last cleanup in topic #2752. I'm not addressing what to do with these yet because I want to focus on renaming everything first.
- precum -> pre-ejaculate because that's what Wikipedia calls it.
- cum string -> semen trail for consistency with saliva trail.
- dripping semen and semen dripping onto panties because that's what Sankaku Complex uses (yes, even Sankaku Complex has aliased cum -> semen).
- ejaculating while penetrated, internal ejaculation, and projectile ejaculation because in these cases it's clear that cum is intended to mean ejaculation.
- cumdump is the one thing not on this list because I'm not sure what to do with it. I guess move posts under it to public use, bukkake, or cum pool as appropriate.
Prior discussion: topic #2752 and topic #2559.