I would suggest to you Christian Mingle dot com if you are looking for a long lasting and meaningful relationship. It also depends on what part of the world you live in and if you are willing to travel.
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I am not sure there are any men only dating sites. IF you mean gay/lesbian dating sites, all major dating websites have this option for you to choose on them.
It may be ideal to check out Match.com, or Eharmony.com. These are match dating sites and can help you find the match you are looking for by completing full profiles.
There are a lot of good dating sites. There is match.com which is a well known popular site. Also, if you are a Christian you can search Christian dating services. Also, try Facebook or MySpace.
This link leads you to a site that has a list of the best online dating sites for 2012 for meeting men online... www.top10bestdatingsites.com/MeetMen
There are many dating sites these days. Here is a site that you may want to check out to see which one best suits you: http://www.100bestdatingsites.com/
HIV Passions is a popular dating site for HIV positive men and women. Its 100% free and for all sorts of ages.
There are some dating sites that not only introduce men to single people but also give dating advice to men. One such website that offers both is match.com.
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You can try www.datehookup.com, www.bookofmatches.com, okfreedating.net and www.connectingsingles.com. But before trying any of these sites, you should read the reviews.
There are many websites designed for people over 50 to meet people for dating. Some such sites are seniormatch.com, ourtime.com. WWW.info.com/overfiftydatingsites is a site designed to help you find the best dating sites for people over 50.
There are a lot of dating sites that offer plus size dating services available. Online sites like BBWCupid.com, BBPeopleMeet.com, and eHarmony.com offers plus size dating services designed for men and women.