I can't believe this is even still a discussion.
Labour and Economics
* By decentralizing the importance of the male breadwinner role in favour of a shared household income, feminism has enabled many men to devote more of their lives to activities besides work.
* By demanding and de-stigmatizing access to family planning, feminism has allowed families and households greater control over the number of dependant children they must support, reducing the pressure on both male and female parents to provide and enabling them to spend more of their personal income on themselves.
* Feminism has played a large role in increasing overall productivity by enabling more people to work more efficiently, effectively benefiting the wealth of everyone.
Sexual Relationships
* By enabling women's sexual autonomy, feminism has resulted in an overall reduction in sex-related stigma and enabled a wider range of people in general to have sex more often and much more freely.
* There's a good argument that feminism has greatly improved not just the quantity but also the quality of sexual relationships for all partners involved by enabling a discourse of sex which focuses on individual pleasure rather than simply on "conquest" or reproduction. Anthony Giddens calls this the dissemination of the ars erotica, and it's not a bad thing if you like pleasure.
* By creating a world in which women are seen as active sexual consumers rather than passive objects of desire, feminism (and gay rights, but let's focus on feminism for now) has enabled men to regard themselves, through the eyes of women, as objects of beauty and desire. This is a mixed blessing, but on the whole it has been very good for most men. The ability to take pride in your appearance without it being a requirement for social acceptance (as it still often is for women) is, from a capability perspective, generally a good move.
* If you're LGBT.. well.. do I even need to say anything more? The campaign for acceptance on the part of gay and lesbian intimacy and transgendered identity, while separate and hard-fought battles in their own right, would not have been anything near as possible or successful without the spread of anti-essentialism, without "gender", without ideas which were first articulated by feminists during the struggle for sexual equality.
Health
* By making gendered health issues political, feminism has allowed them to achieve public visibility and to be a matter of public interest rather than a shameful secret. It is now possible to talk about impotence, prostate and testicular cancer and other specifically male health problems in public rather than merely in a private discussion with your GP.
The result is that men today, while they still lag behind women in terms of health awareness, are more aware of their own health than at any point in history.
Affiliation and Emotion
* Aside from sex roles, feminism has also offered men new ways of interacting with other human beings away from what were once considered to be the "intrinsic" traits of aggression, stoicness and competition. The ability of men to share emotional support and friendship with women, the ability to be caring or nurturing towards children, even the ability to create close bonds with other men have all been enhanced by the move towards social equality and away from essentialist narratives of polarized gender traits.
* Through the questioning of sex-specific behavioural trends, Feminism has also broadened the emotional capability of men. It has significantly reduced the stigma, for example, on men crying in public, it has allowed men to express strong emotional attachments, and it has begun the long process of dismantling the blight of fear and anxiety which has traditionally plagued male emotional development. Moreover, feminism has given men who desire to do so a language to articulate their own liberation.
Understanding
* Probably the most important thing which feminism has ever done is to give us a language and a conceptual "toolset" with which to explain the workings of gender and inequality in our society. Obviously, this has allowed for us to talk, for the first time, about the role of women in subject areas where their existence was previously ignored, but it also given us new tools for understanding and appreciating the subject position of men.
Without feminism, we could not have "men's studies" or "masculinity studies", for that matter, we could not have "gender studies", "disability studies", "LGBT studies", "queer studies", "[ethnicity] studies", certainly not in the form or at the level we current have them. Some of these things grew out of feminism, others grew up alongside and yet shared a common language and concepts. The fact remains that feminism has made an enormous contribution to scholarship, it has enormously broadened our understanding and the way in which we can study the world around us, and that has benefited anyone genuinely interested in any kind of knowledge in this area.
To quote Michael Kimmel: Feminism is always about men. Every time a feminist has said something about women, there is at least one man standing implicitly in that sentence who is nonetheless shaped and affected by what is being said. In rare cases, what has been said has been harmful or hateful towards men, but in almost every case it has been positive, it has been about increasing male capabilities and human development.
I could do this all day. I have just wheeled this post out without even thinking or stopping to look anything up. It's absolutely not a comprehensive list.
If you don't think feminism has done anything for men, then I don't think you understand how much of the world around you has been shaped by feminism.