Another single guy's thoughts on the matter. This may be very strange but it's no less true. I am currently with the only girl that's ever been able to finish me with a blowjob. Prior to her I would always accept them. They felt good but beyond that I never saw the point much. So anyway, I can't really speak on if she likes giving them. She does give them though. What I can speak on are two things. 1. She swallows sometimes but not every time. I wish she swallowed every time but I am happy to receive them at all so I keep my mouth shut...so she keeps hers open
2. I like to put my hand on the back of her head and slightly push on it not to force my penis down her throat but to keep her in a rhythm where our mutual goal occurs. At first she wasn't sure she liked that. She enjoys a guy that takes charge in bed (I started doing it one time without asking or warning her) but she did originally think it was to force it down her throat. So I guess I agree with the person (or people) that said to do what it takes to make it feel as comfortable as possible to her and she should do the same for you.