@ Sandyhima, this is a question on banana dick, not how it happens. If there is a new question on that, let other members add their thoughts.
Now back to my logic. The reason I am saying a curved dick is no issue is for three reasons.
1. In 2005 the MTR experiment was done. MTR is kind of a CT SCAN machine that can show the blood flow. In all the experiment it was proved that on a missionary position a dick takes shape as per the pussy glands wants it to be, which is kind of boomerang shaped, or taking a downward curve.
2. If you watch porno, check the dicks closely, most of them are straight or upward curved. Most cases when there is a woman on top position, you will find the girls sit with her back towards a guy, not facing towards him. The reason is that simple, the dick takes a downward shape towards back of the pussy. on reverse cowgirl, it works best.
3. The other reason on porno, you will find most cases, the guy goes slow on her when insert the whole dick, when they go for a fast pace, watch again, they insert only a few 2-3 inch and goes in town. The reason is not to show you the dick and pussy, its more on the curve to stay without pain.
If any of my logic is wrong, I am sorry for my lack of proper knowledge.