I think a better option for Sophia doing a side job would have been working at a local bookstore taking care of inventory, customer service and handling sales. During the job she gets to talking with some regular customers who frequent the erotic fiction section. Her curiosity piqued she starts perusing the books and delves deeper into them reading about certain taboo situations which causes her arousal to skyrocket.
This side job would have been a more plausible reason for Sophia to become more open to exploring her sexuality with herself and certain others rather than the other two side jobs of washing off two dirty old men or jerking off some weird kids. Just a thought