honda tadakatsu -> toyoda tadakatsu . i think the joke here is :
https://en.wikipedia.org/wiki/Honda .
https://en.wikipedia.org/wiki/Toyota .
"tadakatsu was not popular with girls" . actually , in history , honda had at least 1 wife and at least 3 children .
page 7 : the macho guy is alone with a cute girl , and then suddenly he lays down on the ground in face-up posotion , i know what he really wants from the girl , lol .
page 8 : he pulls a barbell out of his a$$ ? lol .
last pages : his hair-style is an ochimusha 's one : https://en.wikipedia.org/wiki/Ochimusha .
omake page : the sweats on her body were colored so wrong , they look like another kind of bodily juices , lol .