I try to have anal sex with my partner and now am...

PENILE INJURY POST ANAL SEX TRAIL ?
in such cases what happened is that your penis got minor cuts and bruises ( and this accured especially in case your partner was a first timer and even though its perfectly normal to have such pain or irritation in your penis post any kind of sex ( not only anal but specially anal ) and this is to be treated by using antibiotic creams such as gentamycen ceam twice a day and stop sexual activity during your next 2 weeks or untill the symptoms are gone 
what are the diagnostic test needed ?
the past medical history and clinical examination are usually enough in such cases 
what are the signs and symptoms of penile abresions on minor bruises ?

• the feeling of pain or burning sensation post sexual activity 
• sometimes the cuts or bruises might be obvious for naked eyes but in some other cases it might be too small to be seen

what is the advice ?
we advice you to visit your family medicine doctor for the right diagnosis and the correct treatment based upon clinical examination