d_elfe and your book Tristan and Isolde describe the love and sex scene really well!
Thank you to Sara_Wilcox who give a good helpful opinion on how to write sex scenes in a novel. I believe it's pretty hard for some people to write it nicely in respectful and elegants ways instead of being vulgar and porn.
I write my sex scene in a prose metaphoric ways - as I really don't know how to write it in a romantic way :D :D