A sex doll, no. I have toys that work just fine or I get find a real guy to fuck me.

I've been gangbanged by 4 guys many times. One time I made them all cum in a glass and was able to make all of them cum twice so there was 8 loads in the glass and I drank it.
Another time in high school I was at a party I sucked off like 8-10 guys in the bathroom, one after another. There was a line out the door and I didn't stop until they all nutted in my mouth.
Yes. When I played travel volleyball in high school, sometimes we would wait until we got back to our hotels to shower and we always had 3 girls per room, so it only made sense to all shower at once. There were plenty of kinky things going on in there. We didn't need soap to clean each other.