There are two main variants of the site
* Full Version
* Mobile Version
There is via the browser's menu sub variant 'Desktop/Non-Desktop' - this alters the layout and the way touch/clicks are handled.

Looking at the sites home page, using the same browser on the same device.

On the full version the main Menu bar has the items :-
Videos, Live Sex, Pornstars, Channels, Photos, Dating, Premium, ...
Note :-
On the Desktop variant, the Videos menu item has a sub-menu
On the Desktop variant, the Photos menu item has a sub-menu
On either desktop/non-desktop variant, there is a '...' button to access a pop-up menu for items that the designer assumed couldn't be shown (irrespective of the available window width)

On the mobile version the main Menu bar has the items :-
Home (via icon), Live Sex, Pornstars, Channels, Premium

As the OP observes Dating and Photos are removed in the mobile version.
As these are between Channels and Premium, then it clear that the menu isn't just truncated, but deliberately limited to the most commercially viable options.

Obviously, the available window width can be variable and limited, especially on a mobile device more especially in portrait mode.

Obviously, a UI designer would request that a pop-up menu 'three dots' be automatically added, when the available window width is less than the space needed for a full menu bar.

Obviously, a competent coder would be able to add the feature easily. Even easier if a common website framework, like React, is being used where such features are already available in the framework.

It is a shame that we are talking of xhamster ..... where, IMHO, such people don't exist.