Coming from a boy, you don't without 'asking'. Anyone can be manipulative and sneaky, and if you do not trust him, the best thing to do is bring it out in the open. (In all but extreme cases). If you bring it out in the open, and he freaks out and leaves you, then he was probably using you... or he would be more understanding.
If he shows you off to his friends, but never really talks to you, he is in it for sex only.
how do i tell if my my turtle is a girl or a boy?...
At 16 weeks it is 80-90% accurate using an ultrasound
No, never let a boy tell you what too do.
you cannot tell if the caterpillar is boy or girl
can you tell if a fish is a boy or girl by the tail
When the girl is sure, yes she should tell the boy.
how can you tell if a boy is flirting with a girl and also likes her to an extent?
its harder for a boy to tell if a girl likes him
YOu can not tell the difference between a girl or boy starfish.
Tell him.
It can be either way, a girl can tell a boy that she loves him or a boy can tell a girl that he loves her.