Generally you gotta kiss and lick and suck on third asshloe while fingering thier pussy get them in the mood and ready for it
This and Vince's advice -
"You just start with two fingers to get her set up, then you go downstairs and eat it out like it was a pot of collard greens like I tell all of my straight friends who ask me for advice, you do that and she opens up like a flower. Once that happens, then you screw."
is really primo stuff. You can't lose.