He's uncut, and we use Trojan Magnums, which work great for his girth, but he doesn't fill them completely out length-wise. Recently when we have sex with condoms, the combination of friction and lots of lubrication, causes the condom to unroll further and bunch up at the top, pulling his foreskin forward and pretty much cutting off most of the sensations to the head of his penis. There have been times when we've had to stop so he could wipe excess lubrication off and re-adjust the condom/foreskin.
Obviously this isn't an issue when we don't use condoms (I'm on birth control), but we tend to have sex with condoms more often than not for just-in-case reasons.
Has anyone had this issue before and does anyone have any tips on fixing it?