It depends on the individual & what they think. Personally I'm of the old fashioned type that likes to get to know someone before getting intimate, but times change & so do attitudes.
If two people are free & it's what they want & prefer, then that's their choice. Some people just don't want all the fuss that goes with dating.
One of my ex's admitted to me that he did have a lot of respect for me for making him wait. He said that if any girl offered it to him on the first night then he would take it. His attitude was if she didn't have any respect for herself, then why should he.