I've been spinning 3 plates since I have been single (July) and every time I have sex with a plate I can't get it up. I try to compensate by being a bit more caring and nice, acting aloof about it, but it's starting to kill me inside.

Before this I had a LTR of 3 years and in the beginning I already had trouble getting it up. After those 3 years I got pretty experienced in sex so I wasn't nervous the first time I had sex with my plates. I was drunk with one of them, and fucked her for 1 hour straight, so she knows I am capable of it. However the times after it (happened 5 times now) I just can't get it up. No matter what I do, I just go flaccid and I have no clue what to do.

I ordered some kamagra online and took an entire pill every session, which didn't help at all. You need to be aroused for it to work but I was pretty aroused and managed to get hard for the entire time we had clothes on, but as soon as I had to stick it in I went flaccid. I wasn't even nervous the first few times because I already fucked a plate well, so I knew it was possible.

When I am lying next to them in bed I can stimulate myself and I'll get hard, but as soon as I move positions or she goes on top I go soft again. When I am with my ex I can have sex instantly, and stay hard for over 1 hour, so it seems to be a comfort thing(?)

What is the correct way in dealing with this situation, not lose face and not make the girl feel like shit about it. I already told them it wasn't their fault, I tend to need time to get it up and I don't come often the first few times, but now we can't have sex at all because I simply can't stay hard long enough to stick it in.