Ive had couple ive always wanted to do.
Helping a lady with a flat tire and she tells you to follow her back to her place.

Voyerism but not necessarily in public. Maybe at night with the curtains open so you could see out but other people cant see in.

While your going at it she gest an important phone call and tries to keep her composure while im going harder trying to make her loose it.

Random meetup with a stranger at the movies and you both are alone but share movie interests and decide to sit together for a handy and bbbj.

Ive got a million of these.