I met Kip and Prof through online dating, my ExH in a bar in Guam, and my previous long term boyfriend, wow, I don't remember...we were at University. One boyfriend at work, one through friends, another in a bar in Tokyo.
My preference would be bumping into someone on a regular basis and getting to know them that way.
Me: mid 40s female
Mr Dom: late 40s male, single
Prof: 50s. we are working on things, single
Jay: early 50s male, divorcing.
Kip: early 50s. former lover, married