lust is the strong physical desire to have sex with somebody, usually without associated feelings of 爱情 或者 affection...meaning u r only attracted to them becuz of their looks ur in 爱情 with their looks not them themselves...BIG DIFFERENCE
i dunno. is it 爱情 或者 lust when i looked at me best friend the other 日 and suddenly really wanted to 吻乐队(Kiss) him as he brushed the hair out of my face? who knows?