I miss the thrill of riding fast down an open road, pushing the bends, getting close to the edge - it's an adrenaline junkie thing - knowing that if you get it wrong, you may pay a heavy price, but accepting that for the thrill of feeling truly alive ... ...I love feeling alive, more than I want to maintain breathing for the sake of it
.
Only by living at the edge of death can you understand the indescribable joy of life. (I forget who said that)

I get less close when a friend is sat behind me - have no desire to push them to an edge they may not want to see. - and it then becomes foreplay - enough of a thrill to pump adrenaline, but tempered by security,,....a leather clad lover wrapped around behind, holding on tightly, expectantly ... feeling their tension as you fly ....it is absorbing and so sensual

Ok to each his own

As if you can talk over a roaring motorcycle engine.