Got to be the first option.
If you're blindfolded then the whole point is surely not knowing who you're having sex with.
Isn't that the thrill or kink?
I've enjoyed such sessions a few times, and the aim is to just submit to what you're feeling.
Not being able to see heightens your other senses.
Your imagination can run riot, but if the feelings you're experiencing are exciting and enjoyable,just go with the flow.
Wouldn't matter to me if it was female or otherwise, I'd possibly not know anyway.