In short, purity culture, misogyny, and unquestioned toxic masculinity.
Long answer, evangelicals believe three key myths: (1) having sex at a particular time with particular people is a matter of life/death, (2) men are monsters who cannot control their urges and thus must be forced, through shame and social controls, to not have sex and ruin their lives, (3) women must help guard men from themselves by not being sexy and are victims of deep misogyny via objectivation. The obsession with sex comes from these points and honestly "porn addiction" was talked about way more than any other addiction I remember from youth group/church
Evangelical men have male friends they call "accountability partners" that confess to each other when they looked at porn (not the other details). The idea is the shame of confessing with keep you from doing it. If that doesn't work, they will put spyware on their computers to keep them from even thinking about going to porn websites.
Why this father/son relationship? No idea, that seems weird to me but everything else is unfortunately very normal if unhealthy
New bit: Fascism gets defeated because the left forms a red-brown alliance with r/KotakuInAction on trying to defend allowing half-naked women in vidya from Christian fundamentalists, the former losing interest in conservatism upon realizing that it means they can't wank off to said half-naked vidya women anymore.
Jokes aside, that's always what bothered me about misogyny. If men are supposed to be the "natural leaders" of women, why do traditional gender roles portray them as sex-obsessed gorillas? If God prefers men, why are men more susceptible to feeling the eeeeeeevil no-no emotion to the point it damages their functioning?