1. ...let her take a picture of you naked?
I would do that with any female I did dares with, so yes.
2. ...get naked in a risky public place?
Same as above, yes.
3. ...act like a little boy and call her "momma"?
Yes
4. ...let her give you a spanking?
Yup
5. ...eat her out until she has an orgasm?
For sure
6. ...masturbate in front of her?
Yes
7. ...let her pee on you?
No
8. ...strip naked in front of her friends (guys and girls)?
Yes
9. ...taste your own cum?
Not sure but probably no
10. ...obey a strict diet and exercise regiment for 3 months?
I’d love to!
11. ...dress up like a school girl with a mini skirt, stuffed bra, panties, wig and makeup?
Yes 
12. ...go without sex or masturbating for 1 year?
That would REALLY have to be my dream girl, but yes
13. ...let her tie you down first?
Easy, yes
14. ...shave off all of your pubes?
Sure
15. ...dress up like a french maid and do chores for her?
I wouldn’t like it, but sure
16. ...let her put clamps on your nipples?
Easy, yes
17. ...cum on your own face?
Same as 9
18. ...let her fuck your ass with a strap on?
I guess so
19. ...strip naked on a live webcam?
Yes
20. ...suck her gay friend's dick?
No
21. ...let him cum in your mouth?
Also no
22. ...let 5 or 6 of her girl friends fuck you with strap-ons and dildos while you eat them out?
Yeah
23. ...have a threesome with her and her guy friend (you give and receive)?
No
24. ...be her sex slave for 3 months (she gets to do whatever she wants, mix between conventional sex and femdom)?
Yes
25. ...be her bitch for 1 week (no sex, but a lot of dress up, chores, humiliation, and oral for her and her friends (guys and girls))?
Guy friends no, but other than that yes