My wife loves the straight in level approach on the couch, she says I go fully deep to the hilt and massage her cervix with my glans. She also she can actually feel the spurts of semen hitting the back wall of her vagina as I override her cervix!
Mine hasn't gotten anything longer then 5"5', but she likes to bend over, so I'd imagine she'd take big dick in that position and not to mention she has a big ass and hips to grab hold of for more power to thrust.