safe NSFW

That's a good one.

But joking aside, try Steam. The more mainstream, the more vanilla. The less mainstream, the more nieches you will see that you will not be comfortable with.

This goes for regular games as well. But usually we go, meh and move on, and not belittle people playing or developing it. For example idle games. Players of those get their fair share of ridiculment. Adult games are just an excuse to see some lewd pixels and have it be more interesting than watching a movie. And the folks here are also here for the "bad" games. Amateur developers and the rare gem they find. And concepts and game play experiments you just do not see in mainstream. 

Actual rape content is not allowed on Itch. But this is in the eye of the beholder. A murder simulator would also not be allowed, and still this is the plot of most rpg. Context matters. It is the gloryfying aspect that gets games banned. You can show rape in movies, why not in games. In fact it is a major plot point of many movies. Banning the thing itself without considering context is pointless. It is a bad thing. So is murder. Using it to show something bad happens is simple story telling. A female prot game featuring this often has this as the negative consequence to avoid and overcome.

I wonder why you did not complain about incest. That nieche actually is "popular" on Itch. And I can explain why. While not illegal - hey it is pixels and made up! - , major platforms do not allow it. So it is seen more on platforms that do not ban it. Also, anything "step" is very popular on actual adult sites.

Otome is a dating sim with a female protagonist. Most of them are not even adult games. As in nsfw adult. But that goes for the whole dating sim genre. Maybe 2 in 3 for all dating sims, and more specicifally with otome games. But as with all genres, Internet Rule 34 applies. If it exists, there is an adult version of it.

And this rule34 applies to all types of games. From beat em up to rpgs to puzzle games to action games. And also horror.

I don't succed to select several tags at once

You write in the little box that says misleadingly select a tag, and click filter. If it is in the suggested list, it autocompletes, but you can write any tag. This adds the tag to the filter url.

Okay, I don't have any problem with seeing boobs. If we follow the logic of this sentence, straight men could only see lesbian porn for fear of seeing a dick, that's not logical.

It is logical, once your premise considers more facts. Because that actually is what is happening. You can observe it in comments of many games. That proverbial straight man will tolerate only seeing one male character nude, and that is the player avatar. And only while being enganged with females.

You could not show for example the character doing a solo act. Or show any of the female npc being intimate with another male npc. The developer and the players of that game will be accused of being cucks. I kid you not. The abreviation used is ntr and means cheating. You could not even show a threesome. Not a mmf anyway. Well, you can, but a developer doing this, will cater no longer to the mainstream adult player audience and will even get some hate. Some of those games do really well, but one should also mind that there is less competition.

The kind of games I'm searching are more with a male protagonist, surrounded by one or several females he try to seduce.

Did you just copy the description of the dating sim genre? ;-)

Some developers use differen tags. Sandbox is also popular. Or just visual novel. Romance. The problem is, that the developer choses the tags, so you can never be sure. And that goes for search and any negative filter you would apply if that feature would be implemented officially. That is why you should look at related games and recommendations after finding games you like. They probably share tags with other games you might like.

And this is important to you, after reading your yay and nay list: just because a dev tagged something visual novel or dating sim, does not mean you will consider it a dating sim or even a visual novel. Technically, every game telling a story with a bit of text boxes ans visuals is a visual novel. And every game where you can fail to score, is a dating sim. And the other way round is also true, so your favorite sandbox management game might not be tagged as such.

But the devs of NSFW games are definitely men making games for men

There is of course a huge imbalance, but this stems mostly from the fact that most game developers in general are male to begin with. Numbers you can find indicate about 1 in 4 is female. Those are general and professional game developers not amateurs having this as a hobby and developing smut games on top.

There is also females making games for other females, but some of those females are not straight, just like the men. And all the fantasy stuff was of course not made by the fantasy creatures for other fantasy creatures, so it stand to reason that female devs can and do create games for men and the other way round. The only prerequsisite is that you are comfortable working with the artwork, but in the end, a job is a job and it is just pixels and made up.

And then there is another thing you might want to consider. Many developer might not admit his or her gender, nor name, nor other private information. Also, while some are indeed solo developers, the line is fuzzy. What if the artwork was commissioned and the artist was a woman? What if it is a mixed team?

Recommendations are tough for you. There is not much couple games. Pandora's Box maybe. But it is a choice vn with corruption points.

I think the best tags for you would be romance, sandbox, slice of life, and of course dating sim. Some of those can hide under rpg or visual novel. There is no popular couple tag, but some should be under https://itch.io/games/tag-female-protagonist/tag-male-protagonist , though some will use it to indicate a customizeable character. Games with multiple protagonists are rare. I remember one that is called Nasty City, but it is not about a couple. If you do not mind the "cheating", actual ntr games feature couples as per definition. Some use it as a tag, but things like that are better found by using regular internet search, possibly with site:itch.io or by reading on adult game message boards.