I can't suck my own cock, but I will be more than happy to suck your cock and suck your ass if you want me too.
I could when I was younger. I'd put a pillow under my head, throw my legs back over the top of me (usually in touch with a wall so I could push my self back up) and suck the tip of my dick. It wasn't easy and I had to pull my hips down hard to reach. I'm sure the back problems I experience now are a result of hyper extending my spine between my shoulder blades.
That said, it was fun.
I tried it a few times by pressing my back against the wall and being upsie down essentially. I could get the whole tip in and down another inch. I could get off but it wasn't really as exciting as a chick doing it.... so I stopped.
Now that I am older I am less flexible and can't do it--I tried after I read this. I could only tickle my head with the tip of my tongue.