Sorry I can't be more help wiht this. This is a HUGE study that will entail a lot of research to predict it statistically high. First one will have to study the ins and outs of the psychology behind homosexuality and as there are different motivations for it, that' will be quite complex. And, psychology may not have enough information about that yet. Then those factors will have to be understood astrologically. That's the easy part for a skilled astrologer. The larger part for a skilled astrologer is learning the psychology of homosexuality.
I think he is not gay because, Sun is in 10th, which is very male. Saturn in 10th, is very neuter. Saturn aspects sun to only 16 out of 60 points, thats insignificant. If saturn was square from the 4th from sun, the aspect would be very strong, but still, sun in 10th, not to likely. So we don't have the important point of Saturn aspecting sun and 10th to any significance.