Temptation is clearly not sin. The Bible explains the sin process very clearly, and temptation is not sin. If I see a pretty woman and notice/admire her beauty, that’s not sin even though some churches burden believers with impossibly high standards. Sin happens when I let the temptation grow into desire. If I want that woman in my heart, even if I restrain myself out of fear of her husband, society’s judgment or whatever, I’m sinning. I see pretty women all the time, but I don’t want to bed them.
BTW, the Bible explains that Christians grow in discipline over time. It’s even possible to learn how to nip temptation in the bud, and we’re supposed to get better at that as we grow in Christ.
Am I wrong to expect that those who have private lives that do not meet the ideals of their religion should not flaunt them?