If I rub my penis on The tummy of psostitute...

will HIV transmit in this situation ?
its wont , both partner body fluids should exist to transmit the disease from person to another 
causes of HIV :
1. unprotacted sex
2. IV drugs intake 
3. by pragnancy and infected mom 
4. medical mistakes and blood donations 
What are the signs and symptoms of STD infections :
1. skin reactions such as reddness or irritation or itching especially around the private area
2. pain during sexual intercourse , urinating 
3. penis discharge 
4. semen color or shape changes 
5. fever
6. flu-like symptoms 
how to avoid STDs ?
- use condom during sexual intercourse whether its vaginal or anal sexaul intercourse 
- avoid multipartner- sexual practice 
- if any symptoms appeared , consult your doctor and do the needed tests 

yes dear , you dont need to 

you are welcome