Trouble in the bedroom

So a little backstory…. Me (27M) and her (28F) have been together for a little over a month. We are both super attracted to each other and have a hard time keeping our hands off of each other. In public I will finger her in bars and her grab my dick and give an outside the pants HJ in many different public places. Unfortunately I am a grower and not a shower which brings me to my point that I need advice on. We do like to have spicy sleep about twice a day in the morning and at night. This has been going on for almost our entire relationship. So we have been going for about 45 days of having spicy sleep atleast once a day but most days twice a day. I have been experiencing an issue where in the middle of us having spicy sleep I go soft. Now that I am a grower and not a shower this pretty much ends our spicy time together. I am super attracted to my girlfriend and she has an amazing breasts that turn me on just thinking about it. The issue is that I cannot keep it up. Is there anything I can do about it? I’ve been reading up on blue chews and some viagra alternatives but I am not sure if I am not wanting to do that. Please any advice is welcomed.