This depends upon your socio-cultural upbringing. Make sure you work on your mind-conditionings. Open yourself to experience the divine in every act of life including sex life.
Note down the thoughts which are bothering you.
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Affirmation
Try writing down the following positive affirmation 21 times/day for the period of 21 days and experience the difference.
I let the divine in my unite with the divine in my partner
Note : well designed affirmation could change your life. If you do not resonate with a particular affirmation, take help of an online healer to design a right affirmation for yourself.