I don't want to sound argumentitive, but I don't really see this - there have only been 2 (if that) relationships of any seriousness between the couples in 5 years, far less than most intense work situations I'd guess, mainly because most of us don't work with a camera crew with us most of the time. Whereas actors on location have hours of hanging around, away from home and nobody watching them, which causes much more temptation than acting 'love scenes'. Doing SCD is nothing to most sales conferences, training days, etc that most work people do (in the sense of opportunity - I just realised how cynical this makes me, but I do think 'could I get away with it?' is a big part of flings. Obviously people seriously falling for each other is different, which nobody can predict but isn't going to be that common.)