At least 50 blowjobs to only a few different men or so are still all with a few different men. Call it my own 'moral' thing but as I said before, I would much less prefer to touch a woman who's already been touched by a bazillion different men. Yeah, you can pick it apart if you want to look at it from a purely technical level, but then you could do the same with a lot of morality. You could justify incest from a technical level. I mean, a dick and a vagina don't know that they come from the same blood so if two people who are from the same family are attracted to each other, why not? Sure, babies born from incest are deformed, but you could always wear protection. It's not like babies born because someone got knocked up from a one night stand or whatever is exactly a desirable thing itself.
I'm thankful I'm not alone in my view.