One of the safest and most well - known sites to read mystery stories is the official website of Agatha Christie. Her works are classic mystery stories that are available there. Another good site is MysteryNet, which is dedicated to all things mystery - related, including short stories and novel excerpts.
In general, it can be safe if you use it from trusted sources and follow proper online safety guidelines. However, there's always a chance of coming across malicious ads or fake links.
Rather than seeking sites for'sexy stories', it's better to focus on mainstream literature platforms. They offer a wealth of stories with positive themes. For instance, Kindle Unlimited has a vast library of books that include various types of stories about relationships, but all within the bounds of propriety.