Needs more diagrams
agreed 😁
Scissor me timbers!

It's not like in porn. It's one of those things that's fun to do once but it's not gong to get you off, just it's kind of sexy. The positioning is difficult to maintain and there's not a lot of stimulation since it's not really aligning your clits together very well. Also, both people have to be thin to get it to work well.
It can probably be fun if you add a shorter, double-sided dildo to get some extra stimulation and have the right ramps or pillows to get into just the right position. You can reposition to grind on each other's legs, but not both at the same time like you can in some face to face positions. And there are ways to get it to work if you have the stamina to hold your body in an awkward position. But for the majority of women, it's usually not worth the effort.
That said, try it out. You never know until you try and everyone's body shape, flexibility, and stimulation zones are different.
The thing that's usually stopped me has been simply the amount of space in the bed ... plus other practical limitations like if it's winter how do you stay wrapped up and do it, etc
Step 1:
Sharpen your thighs