life is all about sex, the main human drive is to procreate
so sex is pretty awesome (feeling), but its anything but casual
its the opposite of casual, and if when you do it you only experience casual or friendly feelings, its probably not going so well
a friend, by definition, is someone you keep around but dont have sex with, like an extended family
friends with benefits with is nonsense
more like an unhappy disloyal couple with commitment issues
its good to get several off when your young and in good shape, and most young people are better at that then actual relationships, but theres something to be said for monogamous sex as well
its nice when you can focus all that animal energy on one person and have them do the same, downright transcendent even, when you can even love each others ugliness
id say it depends on your own ego/emotional stability
less committed sex is better for some than others, depends what you need and want
but hell, might aswell get it while you can
do what feels right and good, and stop when it doesnt feel that way. be honest about yourself and have fun, theres certainly nothing wrong with it, it is essentially our gift for being alive