looks are only one aspect to a person. Can you think of some others?
because I don't know her,
because she has a boyfriend.
(hypothetically) because I have a girlfriend
because I don't like her personality
because we don't have a condom between us
because I was too shy to initiate sex
because she didn't want to have sex.
I'd have to love her!
Is this a question trying to work out why someone didn't have sex with you?
Do you know he loved how you looked?
How far did you get before he lost interest?
perhaps he is embarrassed by his size, perhaps he is a premature ejaculator, perhaps he is religious and doesn't believe in sex before marriage.
Why is there no sex going on? I'm not clear on that point...