Sitting next to her and placing her leg over yours

[DMuffin]

Does that mean both legs?
or one leg?

Is it this??

[Pastiche]

Doesn't matter. Do both.
Two for hugs and affection. The other for more sexual intimacy.

One leg over yours opens her legs
and gives you better access to her cooch while making out.
Very comfortable and low-compliant.
Works well in places with limited space.
Like the backseat of your mom's SUV :P

Then take her legs and put them around you as she sits on you.
MUCH better.