A married couple has been together for 20 years. The husband becomes sick and the wife visits him in hospital. She can stay longer than his other visitors because she is his legal spouse.
A same-sex couple has been together for 20 years. One of them becomes sick. The other is treated not as a blood relative or spouse at the hospital, but just as a friend. They cannot legally marry in Hong Kong so they have no spousal rights. The length of hospital visits depends on sympathetic nurses.
If a husband or wife is married to someone who needs an organ transplant, the spouse can offer to donate an organ and they go to the top of the donor list. A same-sex couple cannot.
Want a tax break as a couple? Make sure you're in a heterosexual relationship. Then there's inheritance. In a same-sex relationship you cannot leave your partner your pension.
Same-sex couples are also not permitted to apply for public housing.
These are all examples of discrimination, say Hong Kong's lesbian, gay, bisexual and transgender (LGBT) communities, which want an anti-discrimination bill to cover the workplace, education, and goods and services as well as to encourage society to be less prejudicial.