I agree definitely the guys duty to buy them thought there is very little option regarding fit.I also think it's a good idea for girls to have some to hand just in case they meet with a guy who forgets and says "don't worry I'll pull out" or if there is a reason for allergies.
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@boredguy007 there are female condoms too available, so it can be that
@nayans How do female condoms work? What are they like?
@Mac-One It's usually has an inner ring which is inserted into the vagina with an opening in the front. The intercourse happens through that opening and after ejaculation the condom is disposed. Do google for more information
@nayans Looks like it would be difficult to insert.