As long as it doesn't cause harm to others (self-defense excepted, obviously), you betcha. It's none of your damn business.
Are you in favor of legal abortion?
No. That harms someone, does it not?
Opinions on what causes harm to other can vary. Would you say general police powers cover morality, or are you in favor of gay unions and prostitution?
For the record, I hold fully that the general police powers cover the banning of such activity.