By default, when browsing things, NSFW content is hidden. It must be manually enabled from your account settings page.
Viewing post in Is the default Itch Browse "SFW"?
No problem. Just one thing to keep in mind, all pages are classified mostly by the people who create the content, so it is possible something gets through the filter. We (the admins) flag misclassified things we see but we can't guarantee we'll get everything. It might be worth looking around yourself first get an an idea of what you might see.