I would disagree. Since some actually have background setup and setup lighting as opposed to me taking a picture of my ass in my room with my phone. I would complain more about the inflation porn and furry sex on the front page rather than a posed picture taken that you just happen to think is over the top.
But yeah, sometimes the front page does get out of control.
I'm sorry that you're offended. I just don't think that it's explicit enough to require a mature content filter. There are things I don't enjoy seeing that are on the front page for personal reasons as well, but they're not filtered for my protection and shouldn't have to be. I just keep on scrolling.