UTI caused by oral? Of oral be better?

I'm newly married (3 months) & we are staying apart due to some personal reason. She has a fibroid, (6cmX5cmX5cm-intramural-deforming endometrium)&has intense pain&heavy bleeding during periods.We consulted gynecologist & are advised to attempt pregnancy for few cycles.(since removal of fibroid can cause risks of pregnancy later).I've been visiting her over weekends,&we are trying to hit her ovulation period. Recently she says it pains,(Nir kaduppu in tamizh) possibly UTI,for a week post intercourse. Since her drive is low(because of fibroidal pain)I stimulate her orally for more than 30 min minimum&then use lubricant("Lox" gel) for penetration. 1. Could oral cause UTI?, If yes what measures can I take to prevent the same? 2. Could use of lubricant cause infection? Should we try coconut oil?Or any others? 3. Would simulating in hand instead of oral be better? Because of postpain,she is insistin that she doesn't want orgasm,but is asking me to merely penetrate.(For conception).