Straight porn pays way less than gay porn and is way more competitive to get scenes as a guy. Some guys are only gay for pay, they hate sex with men so they are willing to eventually take a pay cut to transition to straight porn. But Finn is bisexual, he's fine having sex with men so there's no reason he would voluntarily make less money. And he just doesn't emote that much during his scenes or fuck that hard. That's not gonna change with a woman imo