There's probably a dozen ways you can achieve this, but you may not be impressed with 12 of them. Although Dolphin was originally a dating site, it's a bit dated (pun) and doesn't offer all the bells and whistles you may want. Having said that, you can do wonders if you keep at it.
Buttons as such are a programming thing, so doing it that way will require the custom services of Anton (see market).
I suggest you create a multi selection check box profile field with the following options:
I'm happy to meet:
- Couples
- Women
- Men
- Transgender
- - No Men Please
Depending on what your member selects, their profile will read:
I'm happy to meet: Couples, Women, - No Men Please.
That's just one solution.
It's really up to you to be creative, but one step at a time.