I think it is indeed a cultural thing, Lodradish, related to the worship of the 'mother figure' in christianity, especially catholicism, so it's no wonder it's a recurring element in a typically catholic genre like the SW is.
Italy, a catholic country par excellence, is a matriarchate, la mamma is worshipped above all, she is, so to speak, the incarnation of mother Mary; and she was an immaculate virgin, impregnated by devine intervention (Holy Ghost), not by a man
The other Mary, Mary Magdalen, is often described as a 'fallen woman', the harlot, yet she was - according to some gnostic gospels - closer to Christ than the apostles.
Often the two images melt together, especially when an innocent, virginic women is taken by forse and falls in love with, becomes the closest follower of the man who deflowered her. The deflowering of the virgin/woman, also symbolizes is in this vision a first step to the most worshipped status she can reach: that of the mother/mamma.
This idea is very strong in a film I watched last weekend (and am reviewing actually) 10.000 dollari per un Massacro, in which Claudio Camaso kidnaps a young girl and deflowers her; when she is freed from her rapist, she runs back to him.
The idea is present in The Hunting Party, but you could argue that the film was influenced by the SW
I remember also a film with David Jansen, Macho Callahan, in which a woman kidnapped and raped by him, eventyually falls in love with him