Text: Rosenberg also points to one reason to think the HIV-negative gay male may actually live longer on average than the straight  Gays may have higher incomes and more education on average than straights--two factors powerfully correlated with longer life spans.
Entailment: Rosenberg says one reason HIV negative gay men live longer than straight is because they are wealthier.
Contradiction: Rosenberg says one reason HIV positive gay men live longer than straight is because they are wealthier.