Why block her? You might as well straight up ask for a bj and see what happens. It reminds me, when I first heard of tinder me and some buddies took my friend's phone who got it (this was like 2-3 years ago before everyone had it). We right swiped everyone and matched with this really gnarly fat chick and started messaging her.
The first message was literally, "I want to fill you to the brim."
You would think she would block him, but she responded something like "lol thats gross. what are you up to?" So I guess the point is, she can't say yes if you don't ask.