Riding an uncut dude/pregnancy?

Hey ladies do yall have any tips for riding a guy that's uncut? I dont want to hurt him and pull the skin back. Also I read online that it's harder to get pregnant when he is uncut because the semen will get stuck in the extra skin??🤷‍♀️🤦‍♀️ Anyone know if this is true? If it is any advice on how to avoid that problem when trying to get pregnant? Thanks ladies😚