What is the ruling on delving into sexual topics for entertainment and laughter, such that it becomes the sole topic for those who are unmarried and have no need for it?

Mentioning sexual intercourse without need is disliked (makruh), and it may become forbidden (haram) if accompanied by a bad intention, such as arousing instincts or inciting desires, or if it leads to that. Therefore, one should turn away from it and occupy oneself with what benefits in both worlds. We remind those who do this of what Ahmad narrated from An-Nawwas ibn Sam'an Al-Ansari, from the Messenger of Allah, peace and blessings be upon him, who said: "Allah has set forth a parable: a straight path, and on either side of the path are two walls with open doors, and over the doors are hanging curtains. And at the head of the path is a caller saying: O people, enter the path all together, and do not deviate. And a caller calls from above the path, and when one wishes to open anything of those doors, he says: Woe to you, do not open it, for if you open it, you will enter it. And the path is Islam, and the two walls are the boundaries of Allah Almighty, and the open doors are the prohibitions of Allah Almighty. And that caller at the head of the path is the Book of Allah, the Mighty and Majestic, and the caller from above the path is Allah's admonisher in the heart of every Muslim."