Or:
Question X-1
Are you sexual?
1) Yes (go to question X)
2) No (go to question Y)
Question X
How sexually attracted are you to males on a scale of 1 to 5 where 1 is not attracted to at all and 5 is very attracted to?:
1 - 2 - 3 - 4 - 5
Question X+1
How sexually attracted are you to females on a scale of 1 to 5 where 1 is not attracted to at all and 5 is very attracted to?:
1 - 2 - 3 - 4 - 5
Question Y:
Have you ever felt romantic feelings towards someone or could you see yourselves having romantic feelings towards someone in the future?
1) Yes (got to question Z)
2) No (go to question M)
And so forth.
Yay for having a mandatory class on how to design surveys.