Yes I'm sure. I just started re-playing it, I play as a male submissive bottom and I took on the offer to give the guard a blowjob. It was a short scene too, nothing else and it still did. Other one was actually a multi action one (krampus statues) but it still should have effected mouth and ass only, not cock. So yea I'm pretty sure.
Edit: I tried some other scenes too, giving a male bandit a blowjob after teasing and submitting, and relaxing in tavern with bitch fame and giving a handjob/blowjob and both ended up raising cock sexual experience too.