Disclaimer: IANAL
1. If during a football match you have cameras taking random shots at people in the audience, you don't actually need releases. AFAIK, nobody gets them in such a situation.
2. HOWEVER, for an adult shoot, even if soft, I would NEVER rely on something like that. Not even in the form of some "verbal model release". Among other things, you can easily get into 2257 trouble.
Truth told, though, if your information is "a few years old", it is entirely possible that people were more relaxed about this stuff, back then. Laws and customs change. I hear that in the eighties, some early gonzos (of the 'real-ish' type), were actually shot 'impromptu', without even bothering to ask the girls' ages. Unthinkable (and dangerous) today. Don't do it.
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