Pour one drop on it so that it will retain much.

To Rabbi Shalom,
 
There’s a secular girl I know that I want to be in a relationship with. As is the case with secular people in general, I assume she’d like to have sex before marriage.
 
I agree with the mistress law, but I think it would be difficult for me to ask her to immerse herself in a mikveh early in the relationship without putting her off the idea of ​​being in a relationship with me.
 
The question is – is a shower considered a mikveh according to Torah, and then it would be permissible to go through a niddah only according to rabbinic law when the goal is to establish a relationship with a pro and rabbi, which is according to Torah (and one can also refer to the idea of ​​marriage, which is a mitzvah according to certain poskim.) And is it only a temporary situation, which I will not agree to continue after intimacy is established? (Then it turns out that I am making her not miss the niddah of another partner she may have, and overall I am reducing offenses such as breaking one Sabbath on him so that he may keep many Sabbaths.)
 
(I don’t take it as a “lie” that I don’t say that later I will ask you to take a dip. This is the way of courting that not everything is said at the beginning)
 
Thank you very much.