Not all people bleed but some do
In most of the times it bleeds when the hymen breaks.
It is fairly common for there to be some blood when the hymen is broken yes. It isnt something to be alarmed at unless you consistently bleed when having penetrative sex.
Yes, it doesn't hurt, but it bleeds for the fact that it is a layer of skin.
Yes but not alwayswww.webmd.com
Yes, it's a muscle that becomes apart of the rest of your vagina.