Because guys think they are entering a lifetime of not having to chase tail anymore, getting frequent, freely given sex. Girls offer sex to guys in return for status and things, and girls would just as soon stop having to have sex all the time, since they do not like sex. But every girl knows they cannot get the higher quality status guy without offering sex, and so it becomes a competition. The girl who puts out the best sex will get the status of the proposal and marriage. Again though, girls do not like sex, and so will cease to offer sex shortly after the marriage. So, in short, girls get married to stop having sex. Skinny Brunette Facial