I used to masturbate onto birds at a local park. Not a thing that I'm particularly proud of but I became quite good at it. I was taking zinc supplements so I was shooting massive loads and it became something of a sport to me. For anyone interested here is your best strategy. first, you need to find an isolated spot so you don't become a sex offender. I found a short kind of channel area where I saw the pigeons would congregate. Next, you arouse yourself. I was usually content with envisioning the occasional jogging lady coming over and taking a ♥♥♥♥ on my chest and that was enough to fuel the fire but if you're not as sexually charged as me just take some porn on the go.