I will rephrase your question to help you out. It appears to be in two parts:
1) Is it possible to be gay and conservative?
Answer: Yes, there are undoubtedly gay conservatives.
2) Could a homosexual be elected president if he were otherwise conservative?
Answer: There is no law against it, but I don't think he would be likely to win the nomination.
Thats a YES - you believe you can be ambivalent to adultery, support the homosexual agenda and still be conservative.