Simplify the following text for a Grade 5 native English-speaking person.
Original: A sex doll ( also love doll or blow up doll ) is a type of sex toy in the size and shape of a sexual partner for aid in masturbation .
Simplified: A sex doll ( also called love doll or blow up doll ) is a sex toy . It has the size of a sexual partner , and should help with masturbation .