On GOT7 Jackson's appearance on JTBC's 'Dating Alone', he answered Sung Si Kyung's question "Which part of female's body you can't take your eyes off?"
Though a bit hesitant, Jackson confessed, "Honestly, the thighs." He referred to Beyonce's and added, "I prefer girls with big thighs."
He also answered if it's fine for his girlfriend to watch a movie with a friend of opposite sex. Jackson expressed if it's a family member, it's fine but unless it's not that kind of situation, she shouldn't.
Sources: 1,2