A lot of women are taught from a young age to not to be direct in voicing their objections because it's "not nice", "a girl/woman should always be nice and not rude", and when older "being blunt like that makes you a rude bitch". You can see this conditioning as young as pre-school or pre-K when Mary gets upset because Keith took her toy or hugged her, and the teacher dismisses her upset and says that Mary needs to make nice and share or that she should return the hug since Keith likes her.
A lot of men are oblivious to the subtle clues that women are conditioned to put out. Science fact, women have more elaborate social rituals and more elaborate social communication, and that comes out pretty much when the ability to communicate verbally kicks in. (No slight on men, they have other mental strengths popping up that early that women don't have.) So it's not surprising that men completely miss what would be noticeable to a woman. And the "not nice" conditioning comes from grown women to young girls, not men to girls, so it's all tied into the more elaborate social communication.
So unfortunately there are often times that a woman is putting out "not interested" hints that are too subtle for the average man. She doesn't understand why she isn't listened to, she won't be more firm because she doesn't want to be a rude bitch, he is clueless because she just seems shy, he thinks his enjoying the view is too subtle for her to catch and thinks that she'd tell him if she didn't like it, and he's not a creep and would back off if she said the message directly rather than giving hints that are going over his head.
And, be honest guys, would you prefer to be shot down immediately before you've invested a lot of effort and gotten the sense that she likes you back? Would you be more upset if it came out weeks or months later that she wasn't interested all along? If the answer is yes, then my fellow women, isn't it worth it to be that "rude bitch" right from the start and use our words to say "no"? Isn't it worth it to keep the uncomfortable level down by using our words in the beginning?
There was a time where I had to be near a creep, not a clueless guy, but a creep, he pinched my ass and I told him that if he ever did it again I'd break his arm and he took me seriously. He didn't bother me again. The other woman, who just stayed silent, he kept bothering her until she finally went to the people in charge. While I wouldn't advocate the threat of breaking a bone, being that rude bitch saved me a lot of grief.