This is the painful fact that many people choose to ignore. There will be a few good men around who will combine the urge for sex with some love notes and maybe claim to fall in love and yes it is also true that there are many men who seek love and not sex in relationships with women; but they form a minority of the male folk.
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To test this theory; just try and remove sex from any male and female relationship and see how quickly the house tumbles. Most men seek sex first then maybe, just maybe fall in love in later; but the main driver is usually sex.