Travel experiences are also good topics. You can share your adventures in different cities, like the beautiful architecture in Paris or the vibrant nightlife in New York.
I'm not sure specifically what that refers to as it's a rather vulgar and unclear statement. It could potentially be some sort of unethical or inappropriate situation in a made - up or real - life story, but without more context it's hard to define exactly.
This kind of description is unacceptable. Society has moral boundaries, and we should focus on positive, healthy and ethical topics instead of such disturbing and inappropriate ones.
Forgiving him depends on a lot of factors. If he is truly remorseful and willing to work on the relationship, it might be possible. But it won't be easy and will take time.
I'm not sure if this is a very common story. Each person's experience in the gay community is diverse. There are many different relationships and situations. Some may be more private and some may unfortunately be exposed in a negative way like this, but it's hard to generalize it as a common or rare situation.
If you've caught your husband in such a situation, first, take some time to calm down. It's a very shocking discovery. You could consider having an open and honest conversation with him about why he did it, your feelings, and what it means for your relationship.
In terms of privacy, it's a very personal matter that should have been respected in the first place. No one should be spied on or have their private actions exposed without consent. Morally, as long as it's between consenting adults, it's not for society to harshly judge. Everyone has their own sexual preferences and ways of expressing love and intimacy.