Oh, I understand it very well, and was active in a rare non-judgemental forum for a long time. The actual act itself is often triggered due to short term events, but people contemplating suicide have often lived with depression a long time, and among them, interest in methods is so high that most 'help' forums will outright ban any discussion of suicide or methods and/or threaten to call police on anyone discussing it. Most will have had suicidal thoughts for months or years, and looking at how to do it is a normal component of that. Many will prepare for and have a method that is at least realizable within a few days to a week.
Most are smart enough not to actually admit to it to healthcare or family, as nothing good for them, personally, will come from that, so I think it looks a lot more sudden and unresearched in many cases than it actually is.
I doubt masculinity has much to do with it; the human body is simply quite durable. If you want to be certain, it all comes down to one thing; destroying the brain, physically or by oxygen starvation. Most effective ways to do that are by necessity quite violent, and the ones that aren't are technically complicated or highly uncertain. As both men and women contemplating suicide will find that out quite quickly, the disparity must be explained by something else. And like I said, personally I think it's largely due to men being quite sure that they're not going to get any long term help, so they'd better make sure they're off permanently.