Hi, and welcome to Oxwall. :)

Some of what you want to do can be done by adding questions or editing the questions in admin users profile questions.  And some of what you want is custom programming which you will need to find a developer to do that for you. 

Regarding the little symbols have you seen these.. 

https://developers.oxwall.com/forum/topic/13957

and then you have the gender codes here 

https://developers.oxwall.com/forum/topic/13787

1. You can create two profile questions one for "female sexuality", and one for "male sexuality" with the selections associated to each. Then you create user roles for Male, Female, and Couple, and assign the questions as they apply to each role. On sign up, when they select the role, the questions associated to that role will be shown.

2. This is currently a custom code modification. The system will only acknowledge one birthdate. You can add a second birthdate field to at least have it displayed on the profile. This is what I've done. The birthday plugin, and other plugins associated to birthday will on look at the base birthday question though, so the added field will not be recognized by them.