During one of the drills we were required to defend against a frontal bear hug. One hand traps the opponent's arm and the other pinches his thigh OR smacks him in the nuts. Groin, I mean.
In my Traditional taekwondo school, I happily smack both guys and sometimes girls (my students) in the groin region lightly in order to increase their awareness that this area is a legitimate target for both hand and leg strikes. Most of my students are very good at wearing groin protection. However, the first guy I practiced with was, how do I say this politely? He, erm, ... was a real hang loose kind of guy. I'm just glad I was 'discreet' and didn't go all out to be too 'friendly'. Wink.
What I wanted to say is framed with the fact that with controlled strikes even a groin protector would not totally protect your groin, so a person learns really quick to increase coverage of this area whilst defending and especially when attacking. However, groin protectors allow you to apply such attacks with relative safety.
Kicking techniques higher than waist height should have the practitioner reaching down with the back or front hand to protect your nuts. No I don't mean groin. I mean nuts. If you wrongly think that a hand placed in front of your groin is sufficient, think again. Practitioners who aim for your nads will know much more than a person coming out from a 3 hour self defence course - their kicks are going to be coming from underneath and will target your nuts in a big way.
This means you have one hand up to protect your head and one hand down to increase coverage under your leg. Practice this with all kicks - prioritised in the following order: roundhouse kick, hook kick, and side kick.
Enough from me now.