I know, I've probably seen the kissing from the saddle somewhere. I might revisit those flicks for fun.
Also, in the 5th century AD the stirrup was not yet used and saddles were wooden frames with blanketing. Women rode astride. The side saddle didn't come until later.
The reason I like them on the horse with a stolen kiss is because they will be confronted by a jealous suitor who has followed them, but I can put them on the ground as well.When they hear approaching horses (bad guy doesn't ride alone) they can remount.
Yes, my heroine has spunk, position and has been raised unconventionally more like a son. She is the only child of a senator. She loves horses and can ride really well (a personal fantasy unfulfilled). <g>