I got my bike a year and a half ago, and my girl said she wanted to ride, maybe...
We got ready for the first ride together and it went something like this...
I got on the bike and started it, and told her to swing her leg over and get behind me... Her leg started coming up and she did that cute thing girls do, ya know: make a funny face squeak a little gasp of fear, etc... then she put her foot back on the ground... (to her defense, she'd never ridden before, and this was at my family reunion so there was a crowd of onlookers) This routine of leg up and a little further, repeated itself over and over every couple times she'd get her leg onto the seat and almost over it... but to no avail.
Finally, after at least a half hour of this, she got on and held me tight, while I slowly drove us down to the resort about a half mile away, and back to the house. My top speed was probably 20mph, and we didn't go very far, but it was nice. Anybody who has ridden with a woman knows how nice that squeeze from behind is.
Anyhoo, after we got back, she got off, and said she loved it!
Every time we've ridden after that, she takes all of 5 seconds to get on the bike!