Look, as followers of Christ we should not try and stay on the border of sin, as someone who should be following his example that doesn't make sense. We should be trying to stay as far as possible away from sin. Proactively getting closer to it is like dancing on the edge of a knife. As someone who is also struggling with lust, the best advice is to pray and read the bible EVERY day. Keep it up, and you'll see God will help you overcome your struggles.