I'm a guy and I've found it takes longer for me to cum whether it's a blowjob or intercourse. As for eating out I prefer to have it near the edge of mattress so I can get on my knees on floor. That way I can lick, poke, spread etc easily.
Being a guy that loves eating pussy, I think this might be to dangerous. Think about it, you’re standing over my head as I position myself under you, I give you a very intense orgasm and you get weak in the knees and come tumbling down on me. I could get my tongue permanently longed in your pussy.
Never done it standing, but would love to try. When I've had it done to me from behind while leaning over the couch I was on my feet. Does that count?
Had it both ways. It's easier for the partner who sucks the cock. They can kneel down or pull up a chair and have a go. For her she has to spread her legs and lean back a little so I can get my tongue in there. After a bit my neck gets stiff from craning back.
I like: My girl sucking me while I'm standing. ME sucking her pussy while she's lying on the bed/sofa.