I'm scared of falling in love because I fear contracting a sexual?
Get some therapy. That's not a flippant answer. You clearly have a level of anxiety that does not match reality and is not based in real associations. The best way to solve that is with professional help. Oral sex does not cause stds. Oral sex with someone who has specific infections that are transmitted from genital-oral contact transmits those infections. If your partner does not have one of those infections, you won't get them. There are ways to reduce the chance of transmission even in the event of exposure to one of those infections. Love has nothing to do with oral sex and vice versa. Fear that is out of proportion to the reality of a situation is anxiety. There are professionals who are trained to help people deal with that. Everything about the question is a non-sequitur. Please get some help. If for no other reason than to get better educated about basic biology. You'll feel a lot better with proper help.