Personally, I don't think it was information Madonna should have made public. It's not really something I would imagine anyone would want to know about, or at least, I don't want to know about it. I especially don't want to hear it from someone we actually deem a role model which is sort of the role your placed into when you become a celebrity.
As a celebrity, not only are you representing yourself, but also, the industry from which you became famous. You are also setting an example to adults and the younger generation. Deciding to publicly degrade men for something that some are very insecure about is crule so I don't think this will have gained Madonna many fans. Madonna's comments seemed tactless and objectifying. I do agree with comments on this thread where if a man said these type of things about a woman, about her body, the man would have been publicly disgraced, being called a "pig" etc, however, i've noticed that at the moment, because of the feminism and male bashing that's not only taking over politics, but also films (for example - the Marvel franchise and the James Bond franchise, etc) and music, that comments made by women are treated entirely different to men.
I mention these trends because Madonna has been part of the feminist movement, in her own way, since the 80's and I do think that the comments about not being with a man with small genitals, was her exercising her ability to speak louder about how she can do better and now because women have an opinion, which they didn't really have years ago, that now it's acceptable that they can talk about anything, even if it's blantantly stupid, sexist or immoral. She might have been sharing this information just because she feels it's okay to insinuate that men with small penis's are avoidable, which tbh, is pointless information and it's an opinion that will only suit a certain audience, however, I think she's taken the opportunity to jump on a band wagon where yet again, the male sex is being ridiculed to give women a laugh and a bigger platform, so when I hear comments now that men were sexist and mysogynistic in the 50's, 60's etc, I actually laugh at the hypocrisy as now the gender's have sort of reversed roles in recent years. Or at least, it appears that way.
Example of my views - If anyone hasn't seen it, on twitter, there is actually a hashtag #MenAreNotVeryGoodAt. Another example of how hundreds of women used this chance to have an unnecessary dig at men as a gender. There are other examples, but this is the most recent that i've seen. This did cause a lot of controversy when it was trending because over the last year, it appears that men are slowly losing their voice because of the domineering female power which seems to be overriding every subject atm, because they think a fight, which in a lot of ways, was won like 20 years ago, is still not yet finished, so now they have to take things further.
By the way, I'm not saying all women think and act the same before this assumed. I have met some women who agree that the feminist movement has taken things too far in recent years. Probably because of articles such as this one where Madonna, a woman of power and influence, is shaming men's bodies publicly and will make a lot of money out of it.
I am sharing my opinion because I honestly feel that my gender, as a male, needs to be defended. If my views are offensive or controversial, then I don't mean to cause offense, but I am drawing attention to how society has changed and it's not for the better as much as some like to think. I'm not saying that some men do not have their sexist and misgynistic moments anymore and that it's disappeared, however, women have tried to gain more rights for a long time and a voice and now that they have, some of the women (particularly in power) are systematically ruining and destroying the hard work many women put in for decades, because two wrongs, do not make a right. In other words, because men did it to us, we do it to them, which is exactly how I see things atm. Public scruting to make a point is not the answer! Just my opinion.