This happened to me once, and I wonder if any guys or gals have ever tried this. While giving a bj, insert a dildo into his butt and massage his prostate. If timed properly, and dick stimulation withdrawn at just the right time, this massaging can get the cum flowing without him actually having a complete orgasm, to the point where he will be empty, but still receptive to more bj. In my case, it was more of a flow than squirting, and the O was quite different. The following bj O was almost dry, but huge, and took a long time to reach. This must be similar to the G spot O that my lover gets from massaging her G spot, while I withdraw clitoral stimulation as she starts cumming. She remains receptive to clit licking afterwards, which usually results in a much bigger clit O for her. I think this method can result in 2 distinctly different Os for both partners, and the duration of sexual contact be greatly increased. Comments welcomed.