If marriage were simply a matter of falling in love and having babies, then it would be easy to respond to the OP: InManusTuas (IMT) falls in love with women and, so far as anyone knows, is capable of begetting children, so marriage should be OK for him. But looking at reality instead of an oversimplified model, it's more difficult than that since there are many reasons to get married and there are many ways of making a marriage work. For instance, some people become madly attracted to each other and rush into marriage; others are driven to each other simply by the fear of being alone for the rest of their lives; still others become spiritual friends and slowly come to realize that marriage would be good for them. With all these motives and with all the different kinds of personalities people have, it's clear that marriage is enormously complex, and there's no guarantee that any marriage will be particularly happy.
Now, how does this link up with the OP? Well, first, since there are so many different flavors of marriage, it is conceivable that there is a woman out there with whom IMT could share his life happily. But, second, some of the reasons for getting hitched are simply bad. For example, the case of two people who get married simply not to be alone is, on the surface at least, an pretty unworthy motive. So it's important that IMT get clear on his intentions in seeking marriage. Finally, it is simply a fact that a large majority of mixed-orientation marriages are totally unsuccessful (i.e., end in separation or divorce).
In the end, my advice would be to find a spiritual director and a therapist to talk this out with. (Shrinks aren't just for the mentally ill: they can help people make more objective decisions by informing them of the science that bears on their choices and getting them to talk about their hidden motives.) A little research might also be helpful, so google "mixed orientation marriage" and see what comes up.
Anyway, I hope this rambling post is moderately helpful. Peace.