Don't Ruin It, It was going so well

I understand that people spend time with their significant others early in the day so that they can do what the hell they want to do at night or whenever it is they want to do with the rest of their day. What I don't understand is why must there be an indicator that that's what this shindig is all about? Don't leave clues or hint that you have plans for later because you don't realize that the perfect day you created is now turning sour because you've made him/her feel some kind of way. Sometimes like they were someone to keep you busy until the "real" action happens. Word to the wise...DON'T RUIN IT!!! Let the day go as wonderfully as you intended on it being and when you're ready to go out without him/her later there will be no problems because everyone will have been satisfied. I don't know why so many people have this issue when we should know by now, after all we are adults here, that some things are better left unsaid so keep it moving and again people DON'T RUIN IT!!!