^ Nice tip, but "solid as a rock", sorry to disapoint you OP, but that may not always be the case.
I used to not have morning erections and I stopped masturbating for one month and I still didn't have them. I wasn't even aware that this was an issue!! I also did not have spontaneous erections, for some reason that passed completely by me.
When I realized it I changed my diet. I try to meet my RDA for everything now. I also drink a lot of soy milk, which I think really helps. When i drink it I get lots of hardons! I couldn't believe it. It seems weird but it does,
I have read that if you have zinc it increases your testosterone (link nsfw). You should be aware that there it tons of people telling that soy milk should be avoided if you are a man. I think that they are wrong. But it's up to you.
http://www.google.com/search?q=soy+...s=org.mozilla:en-US:official&client=firefox-a
I also have a dried ginger preserve (mackays) that makes me really horny. Ginger is safe. I have maca powder too which, again, really makes me horny. It didn't at first, but after stopping masturbating for a while, now it works. At first nothing worked at all. It took like a good month. The first half of the month I didn't exercise much and I had lots of stress from school. The second half I started to walk more, every day, went to the beach and it took me about 14 days from there. I don't smoke or drink. I had this Korean ginseng tea that is supposed to be an aphrodisiac, it didn't give me an erection, but I think that now it would, I think it helps, I've noticed that especially on my circulation. Goji berries improve your mood, which is good on it's own but it's also classed as an aphrodisiac. Yesterday I had an erection while I was half asleep that lasted a real long time, I was really horny which hadn't happened in years. I haven't masturbated in like 15 days, but before I did it like 3 times in 4 days. I will give it a few more days and maybe try it.
Oh, another thing that is really helpful is
garlic. I put it in salads (I also eat lots of fruit?!) and it sometimes really works!!??
Here is the dried ginger preserve:
http://www.mackays.com/mackays_preserves.html
Maca powders there are many, try a local "natural shop" that's how it's called in portugal lol.
http://www.ilhwakoreanginseng.com/double_strength_ginseng_tea.html
^ That is the korean gineng tea
I think that you will be back to your natural self in no time, because at least you have 30% morning erections... Compared to none at all it's good.