More attractive in a way that makes people think about love or the body.
The word 'sexier' can make people think of feelings of attraction and desire.
Examples:
The new dress is sexier than the old one.
He thinks red cars are sexier than blue ones.
She feels sexier when she wears her favorite perfume.
I didn't know that cats could be sexier than dogs!
The new phone is so much sexier than the old one.
The idea of going to space is sexier than staying on Earth.