Paradox of Ultra-Orthodox culture

Yes,  I am  familiar with the "party line" about reducing temptations, and yes,  I know it's not unique to UO Jews ( "UO Muslims" espouse a similar philosophy) . . buuuut, isn't it strange that a culture that so vehemently opposes homosexuality, so adamantly insists on separating the sexes? Men eat together, pray together, study together, dance together, walk the streets together, ride the bus together, bekitzur must do just about everything together but sleep together.  Am I the only one who finds this counter-intuitive?