Hijaab of Speech

Talking with non-mehrams( strangers) :

Allah ordered the women to talk to the non-mehram ( unknown men) in a tone which may not make him misunderstand their intentions.
Quran [33:32] …………… be not too complacent of speech, lest one in whose heart is a disease should be moved with desire: but speak you a speech (that is) just.

Islam has forbidden Non-mahrams to meet except in the presence of Maharams ( immediate relative). Many steadfast muslims who have ignored this particular rule haves gotten to a point where they start doing things like kissing, touching certain body parts and just inappropriate stuff. They both know that its  wrong, ask forgiveness and end up doing it again.

Quran [33:33] And stay quietly in your houses, and make not a dazzling display, like that of the former Times of Ignorance; and establish regular Prayer, and give regular Charity; and obey Allah (God) and His Apostle…………………..
The Holy Prophet (p.b.u.h) said to men: “None of you should meet a woman in privacy unless she is accompanied by a mahram (unmarriageable kin).”