It has never been an issue.
Of course, discretion is required.
It has never been an issue as long as you're not necking or sucking face in the hotel lobby before going up to your room.
Just act straight and everything will be fine.
Unless suggested otherwise, hotels would assume that its just 2 male friends catching.
What you do in bed in your own hotel room is your business. And noone else.
Hotels probably would keep a closer watch if hotel guests were bringing ladies into their hotel.
Of course since most hotels require keycard access to the lifts as well as to the hotel rooms, you would have to know the people/guy you're taking back to your room so hotels are not too fussed if you have someone with you as its assumed that you know the person.
So does I get to suck anyone off in his hotel room for giving that information? :-)

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