Any unwanted penetration - giving or receiving - is rape. If it's possible for women to rape men, and it is, then it's certainly possible for a male taking the "bottom" role to rape someone in that fashion. If anything it would probably be easier for a man due to greater strength.
Society second-guesses and minimizes trauma enough; don't help it along. Your pain is valid. And I'm really sorry you went through it.
As for "why so many times"... unfortunately many survivors end up being revictimized at some point and in some manner because early abuse sets them up for later rounds. They are left jumpy, passive, low self esteem, and often obviously vulnerable. And later perps can all but smell it out. If it isn't being taken advantage of sexually, it's in the job setting or being walked-on in your personal life, or all of the above.
"Don't think it hasn't been a little slice of heaven just because it hasn't!" --Bugs Bunny