I remember my first time. I was nervous, she was nervous. So after rolling around and kissing and making out and what I know now (getting confidence and comfort with each other's awkardness).
I stated, hey you have a bunk bed, why not have me lay down and you take your time.
She looked at me shocked but said hell yes sure!
We finished and she had big puppy dog eyes (and seeing a woman orgasm "with" me being the reason was beyond awesome!
Then I was shocked a bit she said wow you made me bleed, and me being silly and stupid said your first time too?
She said really? That was your first holy crap, it wasn't for me but my goodness this was good and you just made it better.
So opening one's legs can also be opening up one's mind and heart too ...