Didn't really read the rest of the replies, except that last one, which IMHO was completely chauvinistic.

Sex should not be a necessary ingredient of any relationship, at least, while they are still in the courting/dating phase. Call me "kolot", but I believe in sex after marriage, because I believe its sacred.

Sex however, is a necessary ingredient in a marriage, BUT should not be the deciding factor on whether a marriage goes on or not.

My opinion on your friend's BF -- this is totally ridiculous. He's ignoring her because she doesn't want to have sex with him? It only goes to show you that the most important thing to him, is sex. You then have to question the motive of why he ever dated her in the first place. This kind of guy should be neutered and dumped.