My graphs are in another state, but from memory, in 40-ish trials:

• About half the time, the encounter ended immediately: either she literally slapped me/walked away/whatever, or the chemistry was too blighted for me to recover.
• Most of the rest of the time (~45% altogether?) she said no, but either converted later (e.g. to a date the next day) or turned me down for unrelated reasons.
• And then a couple of times she said yes (3 times altogether, I'm pretty sure).

There's a lot of fuzz in the numbers and methodology, but 5% conversion was pretty far below my then-average for an otherwise warm, flirty conversation, so I didn't investigate further. Honestly I wouldn't even have done that many trials, except that I knew a fellow who swears by it.