(who's gonna tell him? I have to? Ugh, fine...)
...buddy...
there aren't 7 doom games
there's 1, 2: Hell on Earth, 3, 64, 2016, and Eternal, not counting fan-made WADs which are free and unofficial. I guess technically there's also 3: BFG Edition but that's just 3 again so it doesn't really count. There's also also Final Doom, but that's not made by iD, it's made by TeamTNT and sanctioned by iD, so I wouldn't count it. Finally, there's a shitty port of the game for the SNES, but it sucks so don't even bother. The most widely accepted consensus is that there are 5 major doom games, in 1, 2, 3, 2016, and Eternal, so unless you count 64 and Final Doom, you can't go buy 7 doom games. The SNES port is also just DOOM 1993 again so it's not a separate game.
I wish you luck in your doom-centered quest for bitches nonetheless
thank you for coming to my TED Talk