I can't, but if I could, I definitely would. I wouldn't say it makes you any more gay than giving yourself a handjob... not that it really matters as long as you like doing it.
I could do this when I was younger, but had back troubles in my late teens and it wasn't happening anymore. I loved it though. I would do it every now and then and just suck it to completion. It was my first blowjob after all, so it was a good start!