Lubricant such as oil, butter or Vaseline based lubricants or hand creams and food oils etc. must not be used with condoms.
For insufficient vaginal secretions or for the practice of anal sex, or just to maximise comfort, the use of a lubricant is highly recommended in order to reduce the dangers of breaking the condom. Make sure however that you only use water, glycerine or silicone based lubricants. Water-based or glycerine-based condoms are well tolerated by the body. There is no danger for the condom when using them, but they dry relatively quickly. Silicone based lubricants provide lubrication for much longer, but sometimes they may carry a risk of itching or allergies.
You might need to test several lubricants before finding the best one for you, but be aware that, in each brand, there are different sorts of lubricants for different new sensations such as heating gels, cooling gels or flavoured gels. They can be applied just to the target areas or from head to foot!
Any other lubricant such as oil, butter or Vaseline based lubricants or hand creams and food oils etc. must not be used with condoms. In actual fact, those products change the quality of the latex and make it porous.