Is it permissible for a prospective spouse to express interest in intimacy before marriage, even if generally or by insinuation, and is this considered impermissible or permissible?

The suitor is a stranger to his fiancée before the marriage contract. Therefore, it is not permissible for him to speak with her except out of a recognized necessity. It is also not permissible for him to prolong his conversation with her, even if the talk is permissible. Similarly, it is absolutely forbidden for him to speak about matters of marital intimacy. Communication and correspondence between strange men and women are a door to temptation and a means to corruption.