sex in Greek

please answer those questions in an essay about 650+ words and use 3 sources with citations. 

 How was same-sex desire and activity thought about in ancient Greece? What was accepted and permissible? What wasn’t? What examples of same-sex relationships appear in ancient Greek literature? What were these types of relationships like in Ancient Rome and how did they differ from those in Greece? How were same-sex female relationships viewed during these period?