zepp pretty much covered it all and I agree with him. You should work on your recall, get a dream journal going. As for the WILD its generally better to try WILDing during a WBTB (wake-back-to-bed) as you have more rem periods later in your sleep cycle. There are plenty of tutorials on this forum that go into better detail and I hope you read through them.

Onto the sex question, the topic is allowed as a lot of people use LDing for sex but if you plan on being graphic (detailed/explicit) a warning in the topic might be a good idea.

Lucid dream sex seems to be easier for the ladies but its not 'hard' for guys, seems that a lot of men cant maintain the dream while having sex or getting close to orgasm. I would recommend they try less penetrating and more play/cunnilingus in their first few sexual LDs before jumping right in