I'll try to take a stab at this.
1.Sex is not ping pong. It is much more personal and intimate. There is a reason sex in public is an offense and playing ping pong in public is not. It is not yet another way to blow off some steam. It can come with baggage. It does not belong in a professional environment like an office. Go have sex at home, at a hotel, at a friend's place or in a sex dungeon (if that's your scene).
2.Talk about sex at work with someone who doesn't mind it or infront of someone who doesn't mind it. Personally I am not interested in hearing about your bondage fetishes or your "conquests". Be respectful of other's wishes. If you talk about your sexual life or someone else's in front of people who do mind that creates an uncomfortable working environment.
3. If you say sex is allowed in the office who's to say what kind of sex allowed vs. not allowed? There are infinite fetishes from the mundane to the unbelievable. If you are saying, but well sex in office isn't going to happen in an open setting but in a closed room so what does it matter what fetish is being enacted, well then my friend don't be cheap, just rent a hotel room for those activities instead of asking your employer to provide you with a sex room to indulge your sexual needs. Next you'll ask them to provide you with "companions", after all your employer did provide that ping pong table right?
4. Now you may say well the "puritanical" attitudes of your coworkers creates an uncomfortable work environment for you so how about they conform to your social beliefs? Well you see the majority dictates the social norms. It is a fact of life whether you think it is fair or not. Till a majority's attitude towards openly LGBTQ work colleagues hadn't shifted towards acceptability, having them as colleagues was uncomfortable for people. Then the majority attitude changed and it became acceptable.
Now the LGBTQ community worked hard to change that mindset and my friend in our democracy you too have that option to change people's minds.
But till you have changed a majority's mind you are stuck with our rules. Deal with it.