I (25M) and this girl (25F) have a biological connection

So I was thinking one day what would be the reason why someone that has a biological connection to another person to be taken as advantage against them (as one taking it to a sexual level or even not fit to let anything biologically take place towards their connection together) and a girl that does have this with me (25F) has ever since taken this to next extents , to trying to convince me to a person that could be believed to prove me wrong with how things could be religiously as god existing but only wants to be taking advantage of this connection to prove that she 25F has had been in connection with god to do this as a way of taking advantage over a biological connection and I wanted to know if anyone has any advice for me because this is insanity.?