Absolutely if ur.not comfortable doing it, dont. The no.of guys who c me who ASSUME I offer OWO is high despite the fact its not on my likes list. Most guys accept that I don't, however I had one last week who said rather pathetically 'but no one else has refused me'. I simply said 'its not on my profile, its nothing personal I just don't do it' so he then accepted it and had a really fun time.
Stick to your guns!