bottom is normal as dabong states. sex = can't tell at all yet by pics ... but what age is the plant overall? looks like 4-6 weeks? at what age did you put it into flowering? look closely at the internodes for first signs of 2 little white hairs coming out of a tear shaped pod (first pre-flowers).
looking at the pics, you may be overwatering and overfertilizing as well. leaf curl, discoloration along the edges and tips of new growth, new growth twisting. could also be PH, I keep mine @ 6.4. cheapo ph/light/moisture meters is only $10-$15.