Well, I'm bi, but I prefer men sexually, so I don't have any fave female pornstars.
My fave tops are Chad Hunt, Ben Andrews, and Barrett Long.
My fave tops who also bottom (more often than the other three) are Matt Hughes and Casey Wood.
So... all my fave tops are at least 11inches long, but Andrews has 9 inches of girth (supposedly), though Wood looks thicker than Andrews (Wood is 11x8). And the longest of them is Matt Hughes, at a staggering 11.5 inches (IDK his girth).
And I only have one fave bottom and that bottom is gay-for-pay twink/daddy Kurt Wild. With a lean, hot body with a nice-sized dick (8inches) and Elijah Wood's looks from the neck up (without the gapteeth and the bug eyes), he is the ultimate bottom. And he's the only one who can not only handle Barrett Long, he's also the only bottom who seems to make Long happy.
Granted I don't buy porn (Google Images and free-porn sites stuffed with 30second clips), but I know enough to know that these are my current faves.
Now, if only we can see Matt Hughes and Casey Wood flipfuck.
And see Kurt Wild in a tribute to the prison rape scene from the shotacon anime Enzai: Falsely Accused. In the scene in question, the main character (submissive bottom who tops twice) is raped by all of his cellmates (I think there's 4 or 5) in succession. The first one is his first, who rapes him while the others hold him down, while he has a sock stuffed in his mouth. Then after utterly destroying his black cherry, the other guys get a turn. The tops should include Wood and Hughes, and should all be really young.
And then do a tribute to the other scene from Enzai that I've seen with the warden, forces the character to wear a bell and ribbon around his cock while he bounces up and down on a spit-covered dildo, and then coerces him to ride his dick.
I've only seen those two scenes as a long series of different (and often same) short clips I found on Cloland, under their Toon Movie section (I think they were all released around the December of some year, at least 2-3 years ago). Also, all of the genitals were pixeled out.