Be extremely careful. It’s too easy to be blindsided by, and end up rationalizing our sin.
Perhaps you have a health condition treatable with breast milk, and you’re considering finding a wet nurse, or nursing a sick man.
To do this without sinning, you need to move to a place where it’s so culturally accepted that women can nurse patients in areas that permit the presence of witnesses.
It’s very important to avoid the appearance of evil which 1 Thess. 5:22 warns us about.
Or you can seek freshly expressed milk. Or just wait till marriage, thereby altogether avoiding the possibility of sinning against a holy God.
The more intimate you are with Christ, the more likely he’ll open your eyes to ways you’ve been blinded by your sin. He’ll get you right back on track.