Aggression: Will he be aggressive?

[Rachelle15]

My guinea pig bites me sometimes drawing blood when he wants to go back to his cage (he hates lap time) do you think he would fight another male guinea pig if I got him a friend?

[JD In Van]

He might need to go pee.
My pig, the one who is getting more litter trained, nips at my clothes or hand to give me what I call the "five minute warning". If I ignore it, about five minutes later he pees on me. But his nips are never hard.

Sensitivity to touch though, particularly causing biting can also be a symptom of mites/lice and some other health issues. Have you been to the vet to rule those out?

I don't think lap time behavior's very representitive of his behavior with other pigs. I seem to recall you have a pregnant girl, maybe if she has a boy you could try putting them together and see how he is with a baby boy.

[rabbitsncavyluv]

Have you read Biting Guinea Pigs: What to Do ?

Two males can co-exist peacefully. He may be biting out of pain so you should have him to a vet.