@tnp Customs differed between city-states, for sure. But also keep in mind that their mindset at the time was completely different than the modern one, and so were their hangups.
This is mostly about males since that's what we simple have more information about, but love was written as divided between the 'higher' and 'baser' kind, where the former was between men because it was emotional and not of the flesh (since, after all, it was frowned upon).
Where this all gets really creepy by our standards - and waaay out of this thread's scope - is that boys were expected to be chosen to be mentored by an older man who, if their family thought he was worthy, would train them in hunting, buy them their first breastplate and a goblet.
Anyway. Yeah. Different times.