Viagra/Cialis for recreational use

A question for everyone....

I've only used viagra, Now I'm considering Cialis.

From your experience which one is more effective?
 
I don't know that I'm a candidate for Viagra or any Rx treatment. I'm 48, and have no erection problems. I've always had an extremely strong sex drive and can fuck 5-6 times per day.

Recently, I start having erection problems after I've cum twice.

Here's where it gets tricky. My partner is hitting her premenopausal sexual peak and is insatiable. We fuck 10-15x per week. No complaints here and I've always been the more horny in our relationship.

This leads to us having frequent fuck fest benders. We'll take a weekend trip and spend 3-5 days having sex.

At this point, I am starting to have trouble getting hard for that 3rd round ..or the 1/2nd round of day #2 or day #3.

My erection is noticably less rigid.

I'm in pretty good shape and diet is relatively clean.

I've contemplated getting a Rx for some of these weekend extravaganzas. In January we're celebrating a significant milestone and will be going away to an island for a week. I'm sure it will be non stop sex, so I'm wondering if some boner pills might be good for occasions like that.
You don’t need an Rx you can get great generics online at a very fair price. I love them for rec use