Interestingly, in most of our circle of friends co-ed showers are the norm, not the exception. I’m not entirely sure how it evolved that way, or if it’s partly a local thing, or perhaps because the friends are mostly coworkers and spouses. While no one would be at all offended by a girls’-only shower, they might be a bit puzzled because it would mean leaving out half of the friends in question. As a result, showers, whether bridal or baby, are generally co-ed, and usually involve a fairly big spread of food and drinks, alcoholic and non. There are generally one or two games at the baby showers–match verses of a nursery rhyme, that sort of thing–but not usually any at the bridal ones.
I rather like it, though I can also see the value of a fun girls’-only evening. I should also add that I’ve only seen this sort of shower as the norm in this particular area of the country and in this particular age group (we’re all in our 20s or 30s). I’ve lived in several other areas of the US, and in all of them this would be seen as a bit unusual, to put it mildly.
On the other hand, I do like that the shower is generally tailored very specifically to the preferences of the person for whom it’s thrown, and I also like that we all tend to do a sort of “sprinkle,” if you will, for second and subsequent babies: everyone gets together, eats, drinks, and is merry, mom gets to put her feet up for a while and hang out with friends before a newborn will have her attention elsewhere 24/7, and everyone brings a small gift for the new baby: a set of onesies, some bibs, a box of diapers, that sort of thing.