Throughout the book, Anne writes about her developing relationship with Peter van Daan. Peter was a few years older than Anne, but the two couldn’t stand each other in the beginning and Peter was also quite shy. Towards the end of the diary, Anne and Peter have fallen in love and Anne talks about their first kiss and how naughty it was for a girl her age to be kissing a boy. She talks about how her own mum wouldn’t have even touched a boy until she married her father. An article I read at this link talks about how Anne’s dad Otto actually edited out sections of Anne’s diary that were too steamy to be published. Their attraction was probably unavoidable when they were crammed in such a small place together!