I have legs, but cannot walk. I have a seat, but cannot sit. I have a fly, but am not an insect. What am I?

I can make people bounce, but I cannot jump or walk. People use me to Have fun and jump.

pour me on a girl to give her a good time, pour me in your car to make it run just fine, pour me in your food and I'll make it a fine dine, pour me in your eyes and you're just stupid. what am I?

I'm made of rubber, very stretchy, and you often bring me out when you want to have a good time. What am I?

I’ve served kings and queens, though I never could wed, I lost what was dangling, now sing high instead. Once I had family jewels, now just an empty sack, Lost my cojones, they won’t be coming back.