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the spot where you have to use a tag when you make a post. If you don't use the NSFW tag and there is nudity or sexual content/gore people are going to flag your posts. If they flag your posts you lose your level (the thing next to your name) and if it gets to 0 you can't post because all of your posts are invisible. You should just make your tag "NSFW" and it automatically flags them for nudity so that people don't open them while at work or something.

Thanks a lot

No problem. You will probably get many more votes in that category too as people search for it specifically.

I have hide it,hope it will be good that way?

How can i connect to my facebook profile on here?

I don't know if you can connect to facebook, but you can share your post on facebook. Here is a post from a "whale" account that explains the "nsfw" tag. Hopefully it helps.
https://steemit.com/steem/@neoxian/dear-steemit-if-you-post-naked-or-near-naked-women-you-must-use-nsfw-and-do-not-use-any-work-safe-tag-like-steemit-steem-bitcoin