A good read for those interested in this topic i.e. the pros and cons of finding a co-worker through something like "founder dating" VS. with friends/relatives VS. with coworkers is "The Founder's Dilemmas"[1] by Noah Wasserman.
If you'd just like a preview/synopsis of the book, there's a podcast[2] of the author's talk at Stanford, which covers all the broad strokes and key points.