Sucking in the gut

Last night I discovered something strange, if I sucked in my gut a certain way, I could feel a little more blood flowing into my unit. The point is so specific, about 2/3rds the way up from the public bone to the naval button. I could feel stuff in the inside squishing of course, but it seemed like it made the penis extend outward very slightly.

Is this my hopeful imagination, or is there some secondary relationship to this muscle and the penis? I believe the muscle does connect to the pubic bone, so its possible. Has anyone else discovered some indirect relationships like this?