Huh, that makes sense, thanks.
To be completely honest, I thought there was no way an RPGM game could use or register things like timing and rhythm.
I'll give it a try and 'time it' (I've got a fresh rebirth ready to roll a nympho test) and I'll be stunned if that's really how it works.
Edit: It does seem to be that way
Tried only hitting D (Oral) at the very moment the damage numbers appeared. Five kills later, her Oral Skill suddenly jumped 3 higher (Both Oral and Hand use the same formula and rely on current Stam, so Oral being higher verifies it)