I actually vouch strongly for what Haursen said!
There are good routines and exercises for making yourself last longer.
If one is willing to use money, then sure, there are several delay creams or sprays out there.
Timing is always a thing with those delay creams or sprays. If you use a condom it shouldn't interfere with your partners sensations. And as long it has dried up well it shouldn't affect your partner, but there is a possibility.
While you get delay cream, get orgasm enhancing gel for the lady!
One way, if one has money to spare, is to get a Fleshlight STU and train with that.
But then again, being with someone is so much more than the in and out ...
Edging and learning your PONR would be my choice. No harm (overall) with trying creams and stuff, but one can apply too much and not get any sensation, therefore a limp dick can occur. Just a slight warning!
Blue Chew seems like generic stuff. I can get chewable Sildenafil cheaper elsewhere than BlueChew, but that's because the patent laws are different around the world. So, overall, I can't vouch for the site, but quick glance at it and I don't find it too bad. Price is high though, I recall that one site said that by 2020 Sildenafil might be cheaper in the States.
Taladafil is still expensive over here, I would had tried it but the price is too high at the moment. And Sildenafil has worked well for me anyway.