Reminds me of that deleted scene from Hancock where he has sex with the fangirl and frantically pushes her off of him before blasting a hole in her ceiling with his ballistic velocity sperm, thoroughly freaking her out because she didn't realize having sex with him could be a fatal proposition.
I think OPM would be able to not end her though, after all he has regular punches and "serious punches" so obviously he can control the strength he uses on things. I know the solution though. All he has to do is get any girl he dates to do 100 pushups, 100 situps, 100 squats and run 10k a day. The downside is then he'll have a bald girlfriend.
The animation quality is substandard though.