I heard someone say that Christianity takes away his freedoms to enjoy life. Then I ask, what freedoms? I later heard he was having an extra-marital affair, then I understood his point of "freedoms".

Google defs:
Boring: not interesting; tedious.
Fun: enjoyment, amusement, or lighthearted pleasure.

The problems comes when circular stuff are avoided by Christians and strict church activities are kept.
Example, praying, fasting, worshipping, sharing scripture etc. These activities are fun and have their place but we can't do them all day long. This is where the boredom comes in.

There are other fun activities Christians can do.
Playing football, swimming, horse riding or other sports, hanging out at parks, cinemas or restaurants isn't sinful.

Apostle Paul said:
For bodily exercise profiteth little: but godliness is profitable unto all things, having promise of the life that now is, and of that which is to come. - 1 Timothy 4:8
So he understood the essence of physical exercise. Even medically, it is encouraged as its good for body and mind.

Worldly Fun
Apostle Paul listed the works of the flesh and fruits of the Spirit.

Now the works of the flesh are manifest, which are these; Adultery, fornication, uncleanness, lasciviousness,
Idolatry, witchcraft, hatred, variance, emulations, wrath, strife, seditions, heresies,
Envyings, murders, drunkenness, revellings, and such like: of the which I tell you before, as I have also told you in time past, that they which do such things shall not inherit the kingdom of God. - Galatians 5:19-21

Morally speaking, most of the above listed are frown upon even by society (unbeleivers inclusive).

So, what is the general notion of fun in our society today?
It is often said that people love Money, Power (respect) and Sex.
It is also said that men like to Drink, Smoke and Womanize.

Looking at the above, SEX is the common demoninator as poor or rich can do it.
So mankind loves sex. No surprise at the proliferation of porn. Infact, most online polls will show that PORN levels are the high on the internet. How about places of work, movies, music videos and religious centers. Sex sells, no doubt.

Christianity opposes sexual immorality. This is where the "restriction of freedoms" begins hence we have a lot of questions like:
- Is masturbation sin?
- Is same sex marraige sin?
- Is it sin if I press my girlfriends breasts without actual penetration?
These ignorant questions boils down to sexual immorality but the Bible is clear on where God stands.

Sexual desires are NORMAL. God knew about these desires so He instituted marriage. Apostle Paul said:
But if they cannot contain, let them marry: for it is better to marry than to burn. - 1 Corinthians 7:9

We sure do have a lot of folks "burning" today. Throw porn in the mix and its a ticking bomb. Hence lots of rapists and pedophiles these days. Think about it, if lack of sex is boring then children and babies must be BORED to DEATH.

Christianity isn't boring, some unscriptural Christian doctrines make it look so. Jesus said:
For my yoke is easy, and my burden is light. - Matthew 11:30

So enjoy your life to the full, enjoy your wife if married, get married if burning, and always be grateful to God for the beauty of nature and all its enjoyable benefits.
But the fruit of the Spirit is love, joy, peace, longsuffering, gentleness, goodness, faith, Meekness, temperance: against such there is no law. - Galatians 5:22-23