BB is supposed to be a reality show. In reality peoples lives evolve around "Sex" in reality people "Row". If you exclude either or both then you don't have a reality show.
Exlude Sex and arguments and what are you left with for stimulation and entertainment..
"blue peter"
BB4 was a dull failure of a BB because it was tame and mundane and quite quite boring.
People just getting on is not entertaining unless it is of the nature of Helen and paul wher a genuine will they won't they relationship emerges.
It is highly unlikely that the producers will ever be lucky enough to accidentally select a set of housmates that could replicate BB2's love story so if BB is to survive for another series after BB5 then surley you cannot and should not exclude the aspects of real life in the form of sex and conflict.
Like many i would love to see the mix of sex love and arguments like BB2 had but failing that I also want to se BB survive for more series. exluding sex and conflict will only result in a goody goody two shoes of a show that will kill the format for good.