If I were a man who didn't want kids, whether in a committed relationship or not, I'd use condoms religiously until I got snipped, no matter what the woman said. I've heard of married women who were on BC for years who got the baby "itch" and went off BC without telling their husband, who trusted the wife was still on BC. And if I were with a man who said he was snipped, unless he showed me proof of that, I'd stay on the pill until he did. (Though I'd probably stay on it anyway, since I take it continuously to stop my cycle!)
Cindy