Oh lord, men are always curious! Honest communication is the only way to be certain.
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The guy will have to tell you but when you do the guy will most definetly know.
You can tell if a guy is sexually attracted to you by how he treats you. If he is always trying to touch to you and get close, he may be sexually attracted to you.
Wait until you try to have a baby and he'll tell you then, or even before that if he trusts you.
Non-curious
Because scientists are people and people are curious.