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.
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This is a serious emotional problem. You have to change your perception about the guy. Place him right, as a colleague, or a friend, but if you are in love then open up your feelings to him.
ask if hes gay
The guy will have to tell you but when you do the guy will most definetly know.
Wait until you try to have a baby and he'll tell you then, or even before that if he trusts you.
Mosquitos reproduce sexually.