I think condoms are supposed to be rolled over your cock. Do you manage it with a Trojan Magnum? I normally just pull them over and don't even bother rolling, but the girl I was with yesterday attempted it. She didn't manage and then commented that the condom is too small - not realizing that it's actually a condom made for large cocks (ego boost ... heh). I had to show her how to wrap it over ... Can you roll the Magnum down?