We have good residents of all races, nationality, creeds, abilities, genders, sexual orientation, etc, who appreciate our efforts to provide a quality living environment.In some jurisdictions, not nationally, Section 8 vouchers are considered a source of income and cannot be excluded as a source of income. 

Are you okay with overnight guests of the opposite gender? 

Am I allowed to discriminate based on gender/age/etc. if one or both of the current housemates says he/she cannot/will not live with a particular gender/age/etc.?

People may be discriminated against on the basis of race, gender, age, religion, or sexual orientation - these are protected categories. 

Unless your picture is a gross representation of your gender, you can either scroll through and learn what women experience from their own mouths, or you can scroll pass the topic if it isn't of interest.What you shouldn't be doing is coming in and stating that the OPs general premise is wrong and you, as a man, know all about it why her statement is false. 

@JD Martin You are not the first and assuredly not the last person to bring up my age or gender when "explaining" something to me so I won't address that further.

Some people, based on their race and gender are required to perform better on tests when applying for jobs as firefighters and police officers.  

if so, list type, breed, gender, age, neutered or not, and license #It then has a section for automotive information (make, model, year, license #), and lastly a section for bank references. 

The question: are there common trends in personality type, age, occupation, gender, etc. of the people who let you sell their properties?

As you can see, the same advice is repeated by posters of both genders; no gender discrimination involved in this advice IMO.