Saying picnic was direct, I knew exactly what he meant. He would ask to go on a picnic in the middle of a blizzard. It took a long time for me to be comfortable with (and now even enjoy) the directness. Scary part is I still don't know why it bothered me but at the time it was a real turn off.
Just a guess but maybe it wasn't the directness that really bothered you but the converting of your choice into his demand. Maybe it was your H taking the euphemism "going on a picnic" which was YOUR decision and seeming to demand it instead of understanding that it was something you had chosen to do.
I wonder if YOU had been the one to FIRST say "Hey wanna go for a picnic?" you might have felt much more in control. Instead your H took that control from you which felt uncomfortable??? On the other hand if he had just asked directly for a BJ, you may or may not have said yes but it might not have bothered you as much.
Total guess
But what is happiness except the simple harmony between a man and the life he leads? ~Albert Camus