Barrier methods, condoms and diaphragms (though there are others), are an effective method of contraception that also offers some protection against a variety of STDs. Condoms are readily available at most pharmacies and even “specialty stores”. Diaphragms do require a prescription for a proper “fit”.
The major “drawback” of these methods is the fact that they do require some planning. Some couples find their use easy to adjust to while others use these methods sporadically risking an unplanned pregnancy. The decision to use these methods, like any method of contraception, is a very personal one. Diaphragms do require the use of a spermicide which some couples find onerous.