If found through experience that anything other than a YES is a NO!
There's an old 1 liner: "It took 10 years to become an overnight success."
For us it was years of NO, equivocal, unconditional, absolute NO!!
UNTIL it wasn't.
I kept it up for years (badgered) until she finally agreed to do it (she planned on once only) to shut me up. She took to it like a duck to water, 18 months, 100+ different partners, many repeats, 2 regulars, 2 GBs.