What is the sex of your Mercedes or other car?

I've sometimes named my cars.

My 1968 Opel was Otto. The white with blue interior 1963 Cutlass was Trixie. My 1981 VW Rabbit was Harvey (appropriate, the guy who ran into it said he never saw it.) Lots of cars came and went without names. The 1975 burgundy Lincoln Town Car I bought in 1978 during the second oil embargo for $700 (sold after the embargo for $1900) was the Purple Pig. Asexual.

Currently, my two '83 300SD's are Guderian and Rommel, definitely male. The MR2 somehow hasn't gotten a name, but the only appropriate name I can think of has already been used. It is feminine.

I've seen other 300SD's in this forum with feminine names. Why? Is it the color scheme, the way it acts, or some other reason?

I know you can't look at the rear end to tell what gender your car is, so how did you decide?

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1983 300SD "Guderian"
1987 MR2
2015 Camry
2015 Chevy Spark
2006 Hyundai Tucson