Well, in arab cultures, relationships between man and woman happen through marriage. Sex should just happens after marriage.
Traditionally, in Arab cultures a man and a woman should marry before having sex.
Arabs should get married to be able to have religious, social and moral accepted sex. Arabs lovers are having sex without getting married, but discretely, in secret.
In western cultures theres is the dating time that allows people to get to know each other - spending time together and having sex, before marriage.
Dating can take years, before a marriage proposal.
Even if dating goes well, some western couples cannot get married if they are still studying. They will just be prepared for marriage after finishing studying, have a job and a place to live together.
Dating in the adult life makes marriage easier, as both, normally, have their life already settled.
For western people, there is no point in getting married to live in separated houses or to live in parents house.
When a western woman meets an arab man, she will feel overwhelmed by all the attention he will give her. He will give all the compliments, show lots of interest in her life, be very present in her life, show some jealousy (some women think it is a sign of love) and he will talk about marriage very soon. She will feel special.
For arab men marrying a western woman relieves them from the burden of the mahr (dowry). So, marriage with western women feels less of a business and more about love.
Arab men also experience a freedom of speech they are not used to have with an arab woman.
BUT because being the first men to kiss and take the virginity of a woman is a matter of honour, most of arabs consider western women promiscuous, easy and cheap.
And they just use them to have free sex before marrying a virgin arab girl.
But, why do western women marry arab men from such a different culture and religion?
Arab men take women more serious and marriage more serious. Because of their marriage culture. So, western women that live in a dating culture and are used to go through failed relationships that hardly gets to marriage and her heart was broken so many times.. she will feel special and so desired and loved by the arab man.
In western culture is so easy to meet people and nobody is special.
But will this marriage last? It might depend how religious and culturally open both are..