I think it's ok if you want to use it for your first time penetration to avoid pain because first time penetration always bit pain..but after several time you have sex better not to use it because it can affect sperm..if you TTC better not to use it
Why you want to use it for your 1st timer, don't you wanna enjoy it? I heard it will make low sperm motility
you can try fertility lubricant eg pre seed. im used it and have a fun!