So far the only way i found to get your penis erect is Fighting the Girl who calls the police on you. you have to go into your inventory and select the option to remove your pants. after smacking her with the equiped penis the screen will flash Pink allowing you to Pounce. If you put the pants on at any point while having an erection you lose it. You can also get erect and finish the fight and walk around with the erection in your inventory. IDK what to do with it yet, needs more expiermenting