I don't think most hotels, at least the bigger chains, would even notice if your 'company' arrived...and you don't volunteer any information. If they spend the night, they leave before you do.
If there any fear of jealousy, then you're not ready to share. It's all about 100% trust in each other. If there's ANY chance that it will bite you in the ass later down the road, it will. Discuss all the possibilities, good and bad, and make sure you and your partner are on the same page. No doubts.
It works for us.
( The above comment was only MY opinion, and is fueled by several rum and Pepsis...Pepsie? )