As a result of my Christian values I am an advocate of saving sex until marriage.
To answer your question more specifically, a physical relationship develops after an emotional relationship is underway. Therefore, if you are not building a solid emotional connection with the person you are dating, you will find it very difficult to have a physical one.
So here is my advice, instead of focusing so much on the physical aspect of your relationships, you need to focus on building a solid emotional connection. If a woman feels that she is being used for sex she will automatically reject you. I understand that we all have physical needs and desires, but you are approaching this the wrong way. What you need to do is build a relationship with someone that is true and the rest will come in time!
I Hope This Helps!