Hi Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concern...
No PCOS will not cause any infection in you even if you didnot use any protection. Poly-cystic ovary syndrome(PCOS) is a common female reproductive system disease & not an infection. In PCOS ovaries of females becomes divided in cystic cavities. It is due to excess of male hormone androgen in females body.
Yes the female may have problem in conceiving or getting pregnant, but this occurs in advance cases only. It can cause irregular or no menstrual periods,
heavy periods, excess body and facial hair, acne,
pelvic pain, & other related problems. Since it is not a infection so it will not spread to you. therefore you should not worry about it.
PCOS may cause
pain during intercourse. But mostly pain during intercourse is caused due to low
vaginal lubrication or
vaginal dryness. If you face such problem you should use lubricants during sex
Don't worry you would be fine
Hope this information helps