Personally, I don't believe in preventing / punishing dogs for humping unless they're humping people or other dogs. If they want to hump their toys, I don't stop them as they're clearly fulfilling some inner need, and I won't stop that. My boys have a "lover dog" that they take on dates

. And our girl, Pfeiffer, humps her donut bed almost every morning...for whatever reason.
As far as the penis getting stuck out...yup, been there LOTS of times

. Fun times indeed

! It happens to Marcel, who has a crazy-large manhood for his small body size...so I do have to help it get back in there at times. It doesn't gross me out or anything bc he's my little baby boy, and needs my help. Are you able to get it back in there, or does it just happen on its own eventually?