I slightly disagree. Some persons have no ovaries (to speak of) and no testis. However, they are (in my opinion) female. I am referring to folks with Swyer’s syndrome. They are 46-XY (not 46-XX). They have fallopian tubes and a uterus. However, they lack functional ovaries. With medical help (IVF) they can have children. Since I would consider them female, that rules out (for me) the use of ovaries as a distinguishing feature. Swyer’s syndrome is very rare. CAIS is an even bigger problem (it is also quite rare). Persons with CAIS have 46-XY (not 46-XX) chromosomes and look very female. However, they don’t have ovaries or fallopian tubes or a uterus. Are they male or female? The answer is unclear to me. Don’t worry. The situation gets worse. Some CAIS folks are actually PAIS (the ‘P’ stands for partial).

I would suggest using chromosomes to distinguish between males and females. This approach will work (yield the correct result) in 99.99+% of cases. In the rare cases where chromosomes are not enough, I would suggest using ultrasounds to look for female anatomy.