As a human, religious beliefs aside......... it is clear to me that it's essential for an engaged couple to have sex (great sex) before they legally sign a commitment to staying together for life.
I can understand how a man with erectile disfunction or sexual inadequacies could propose "pre-marital chastity" in order to persuade a woman into marriage with him. I can understand how a woman who doesn't feel like she's a sexual or sensual person or has a complete disinterest in sex could support "pre-marital chastity" in order to lure a man into marriage.
I feel sorry for these people, but at least they have the cover of "Christianity" under which to hide. I hope they all find each other, rather than trapping sexually healthy people into marrying them.
For all other healthy couples - completely explore your physical compatibility, and have fun doing it!!
(Stay safe and healthy, and talk openly about birth control. We're in the 21st century.)